DigiTech HISC Sysex Doc User Guide

TABLE OF CONTENTS

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- General Digitech Midi Implementation

- GSP256

- GSP256XL

- GSP21/GSP21 PRO

- GSP7

- GFX1 (Twin Tube)

- MEQ Series

- IPS33B

DigiTechTM Midi Implementation Manual
June 2, 1991 - First Revision

Dod Electronics Corporation
8760 S. Sandy Parkway
Sandy, Utah 84070
Telephone [phone]
FAX [phone]

=============================================================

Preface

Before reading the DigiTech Midi Implementation Manual you should have a

orking knowledge of the MIDI 1.0 Detailed Specification which may be

obtained from the Midi Manufacturers Association1. Upon request DigiTech

ill provide information regarding their system exclusive commands for all
of their devices. Though we try to provide accurate documentation for our
devices to our customers we do not guarantee 100% correctness. Should you
discover some discrepancies between this manual and the actual device
implementation, please feel free to let us know about it. Please backup your

device's programs before making modifications through midi. Not only is this

A
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A

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a good practice, but it will save you a lot of down time should your midi
commands be incorrect. DigiTech does not assume any responsibility for lost
presets. Please note that the Midi Device Manual is a generic term used in
this document to refer to a device specific Midi Manual. (Example: GSP7 Midi
Implementation Manual)

Midi Channel

ll DigiTech devices can be configured to listen to midi on unique channels.

ll devices allow a selection of midi channels 1 through 16. Some devices
allow a channel selection of OMNI (receive midi on all channels), and some
devices allow the receipt of midi data to be disabled. Some devices allow
you to select one channel for the reception of midi data, and another
channel for the transmission of midi data. Check the Midi Device Manual for
information on how to select the midi channel for your device.

Program Change

ll DigiTech devices recognize a program change command. If the receive midi
channel is the same as the channel that the program change was transmitted
on, and the new program number is legal, the DigiTech device will change to
the new program number. Midi sends program changes 0 through 127. DigiTech
numbers their programs starting at 1. Thus midi program change 0 will map to
DigiTech device program 1. Some DigiTech devices allow you to remap program
changes. Remapping program changes allows the user to select any device
program based on the midi program change. The remapping of transmitted
program changes is available on devices that can generate program change
commands. Check the Midi Device Manual to determine if your device allows
the remapping of program changes.

Continuous Controllers

continuous controller may be associated with a device parameter. This
association is done by linking the controller to the parameter. DigiTech
uses the continuous controller to represent a percentage of the parameters

aximum value. Though this is the general principle, the exact formula for
each device can be found in the Midi Device Manual.

Channel Pressure
DigiTech treats channel pressure as a special case continuous controller.

System Exclusive

GENERAL FORMAT

D7 - D0 Hex Value Definition

11110000b F0h System exclusive status byte

00000000b 00h
00000000b 00h DOD/DigiTech manufacturer's ID number
00010000b 10h

0000nnnnb 0Nh N = Channel # - 1,
i.e. 0000 00h is Channel 1.
0001 01h is Channel 2
.
1111 0Fh is Channel 16

The internal representation of the channel to which the receiving unit is
listening. It is used to communicate with different units of the same device
type connected to a common MIDI line. If the receiving device is set to omni
then this byte is ignored.

0tttttttb TTh DigiTech device type. Specifies the particular DigiTech
product with which communication is being held. (See page 4 for current
DigiTech device types.)

0pppppppb PPh Procedure number. Each procedure's name and general format are
on page 4. Consult the Midi Device Manual to determine which procedures are
supported by your device and the exact data format for those procedures.

0dddddddb DDh
0dddddddb DDh
0dddddddb DDh
. .

. .
. . Data as needed by procedures. Consult the Midi Device Manual to

determine the data format for each procedure.
. .
. .
. .
0dddddddb DDh
0dddddddb DDh

11110111b F7h End-of-Exclusive status byte

Current DigiTech Device Types

DigiTech Device Name Device Type Number

DSP 128 00000001b 01h
IPS 33 00000010b 02h
DSP 128 Plus 00000011b 03h
GSP 5 00000100b 04h
MSP 4 00000101b 05h
DSP 256 00000110b 06h
MEQ 28 00000111b 07h
MEQ 14 00001000b 08h
MEQ 7 00001001b 09h
GSP 21 00001010b 0Ah
GSP 21 PRO 00001010b 0Ah2
IPS 33B 00001010b 0Ah3
DSP 256 XL 00001011b 0Bh
GFX-1 (TWIN TUBE) 00001100b 0Ch
GSP 7 00001101b 0Dh

RP-1 00010000b 10h

m

Reserved 32 to 47 For IVL (20h-2fh)
VHM5 32 IVL Product
Vocalist II 33 IVL Product

TSR-24 64 (40H)
GSP-2101 65 (41H)
TSR-12 66 (42H)
RP-10 67 (43H)
LEGEND II 68 (44H)
TSR-6 69 (45H)

Reserved 50h to 5Fh For Audio Logic

BROADCAST 7Fh, used to send a message to

ultiple devices

DigiTech Procedures

In the following section SYSX_HEADER refers to a valid system exclusive
header. The system exclusive header starts with the System Exclusive status
byte, and includes all bytes through the DigiTech device type. EOX refers to
the End of System Exclusive status byte (F7h). All numbers in the format
definition of each procedure are given as hexadecimal values.

REQUEST CONFIGURATION (00000000b 00h)

SYSX_HEADER 00h EOX

SYSX_HEADER 00h 00h EOX (For IPS 33B only)

When a REQUEST CONFIGURATION procedure is received, the DigiTech device will
respond with a RECEIVE CONFIGURATION procedure.

REQUEST ONE PROGRAM (00000001b 01h)

SYSX_HEADER 01h yy zz EOX

SYSX_HEADER 01h zz EOX (For IPS 33B only)

yy 0000000vb where v is bit 7 of the requested program number - 1.
zz 0vvvvvvvb where v is bits 6 through 0 of the requested program number -

1.

When a REQUEST ONE PROGRAM procedure is received, the DigiTech device will
respond with a RECEIVE ONE PROGRAM procedure.

REQUEST ALL HARMONY DEFINITIONS (00000010b 02h)

SYSX_HEADER 02h 00h EOX

When a REQUEST ALL HARMONY DEFINITIONS procedure is received, the DigiTech
device will respond with a RECEIVE ALL HARMONY DEFINITIONS procedure.

REQUEST ONE HARMONY DEFINITION (00000011b 03h)

SYSX_HEADER 03h zz EOX

zz 0vvvvvvvb where v is bits 6 through 0 of the requested harmony definition

- 1.

When a REQUEST ONE HARMONY DEFINITION procedure is received, the DigiTech
device will respond with a RECEIVE ONE HARMONY DEFINITION procedure.

REQUEST ALL ARPEGGIO PATTERN DEFINITIONS (00000100b 04h)

SYSX_HEADER 04h 00h EOX

When a REQUEST ALL ARPEGGIO PATTERN DEFINITIONS procedure is received, the
DigiTech device will respond with a RECEIVE ALL ARPEGGIO PATTERN DEFINITIONS
procedure.

REQUEST ONE ARPEGGIO PATTERN DEFINITION (00000101b 05h)

SYSX_HEADER 05h zz EOX

zz 0vvvvvvvb where v is bits 6 through 0 of the requested arpeggio pattern
definition - 1.

When a REQUEST ONE ARPEGGIO PATTERN DEFINITION procedure is received, the
DigiTech device will respond with a RECEIVE ONE ARPEGGIO PATTERN DEFINITION
procedure.

REQUEST RAM AREA (00000110b 06h)

w

w

SYSX_HEADER 06h bb ww xx yy zz nn EOX

bb Bank number of ram being requested. Currently the only valid bank in
DigiTech devices is 00h.

w 0000000vb where v is bit 15 of the ram address.
xx 0vvvvvvvb where v is bits 14 - 8 of the ram address.
yy 0000000vb where v is bit 7 of the ram address.
zz 0vvvvvvvb where v is bits 6 - 0 of the ram address.
nn 1 to 7Fh, the number of ram bytes to be sent.

The REQUEST RAM AREA procedure is used to have the DigiTech device send an
area of its internal ram to a host midi device. When a REQUEST RAM AREA
procedure is received, the DigiTech device will respond with a DATA RESPONSE
procedure. The Midi Device Manuals for the DigiTech devices which support
the REQUEST RAM AREA procedure contain a memory map and definition of the
ram locations which may be requested.

DATA RESPONSE (00010000b 10h)

SYSX_HEADER 10h bb ww xx yy zz nn d(1) d(1)'...d(nn) d(nn)' EOX

bb Bank number of ram being sent. Currently the only valid bank in DigiTech
devices is 00h.

w 0000000vb where v is bit 15 of the ram address.
xx 0vvvvvvvb where v is bits 14 - 8 of the ram address.
yy 0000000vb where v is bit 7 of the ram address.
zz 0vvvvvvvb where v is bits 6 - 0 of the ram address.
nn 1 to 7Fh, the number of ram bytes in this response.

d(c) 0000000vb where v is bit 7 of the cth byte being sent.
d(c)' 0vvvvvvvb where v is bits 6 through 0 of the cth byte being sent.

The DATA RESPONSE procedure is sent from a DigiTech device in response to a
REQUEST RAM AREA procedure. If a DATA RESPONSE procedure is received by a
DigiTech device, it is ignored. The Midi Device Manuals for the DigiTech
devices which send the DATA RESPONSE procedure contain a memory map and
definition of the ram locations which may be sent in response to a REQUEST
RAM AREA procedure.

RESET DEVICE (00100000b 20h)

SYSX_HEADER 20h EOX

The RESET DEVICE procedure causes the DigiTech device to reset itself as
though the power had just been turned on.

RESET HARDWARE (00100001b 21h)

SYSX_HEADER 21h EOX
The RESET HARDWARE procedure causes the DigiTech device to reload all of

it's hardware devices.

RESET HARDWARE DEVICE (00100010b 22h)

SYSX_HEADER 22h aa bb EOX

aa The major number of the device to be reset.
bb The minor number of the device to be reset.

The RESET HARDWARE DEVICE procedure causes the DigiTech device to reload a
particular hardware device. The major number is used to identify the
hardware device. The minor number is used to identify a particular element
of a hardware device. If the minor number is 0, then all elements of the
device are reset. As an example, the speaker simulator on the GFX-1
(TwinTube) has a major device number of 2. Valid minor numbers for the
speaker simulator are 0 through 6. If the minor number is 0, then all bands
of the speaker simulator are reset. If the minor number is 1, then the first
band of the speaker simulator is reset. 2 would reset the second band, etc.

RECEIVE MICROCODE (01000000b 40h)

SYSX_HEADER 40h aa bb cc dd ... EOX

aa
bb Repeated groups of 4 bytes.
cc
dd

The RECEIVE MICROCODE procedure is used by DigiTech for product development.

RECEIVE CONFIGURATION (01000001b 41h)

SYSX_HEADER 41h d(1) d(1)' ... d(n) d(n)' EOX

SYSX_HEADER 41h d(1)' ... d(n)' EOX (For IPS 33 only)

SYSX_HEADER 41h 00h d(1)' ... d(n)' EOX (For IPS 33B only)

d(c) 0000000vb where v is bit 7 of the cth byte of the configuration.
d(c)' 0vvvvvvvb where v is bits 6 through 0 of the cth byte of the

configuration.

The RECEIVE CONFIGURATION procedure is used to load configuration
information into the DigiTech device. The number of configuration bytes to
be received (n) is different for each DigiTech device.

DigiTech Device # Ram bytes # Midi data bytes

DSP128 1,572 3,144
IPS33 396 396
DSP128 Plus 1,587 3,174
GSP5 2,291 4,582
DSP256 5,718 11,436
MEQ 28 3,511 7,022
MEQ 14 3,511 7,022
MEQ 7 3,511 7,022
GSP21 5,401 10,802
GSP21 PRO 5,401 10,802
IPS33B 9,088 9,088
DSP256 XL 5,744 11,488
GFX-1 TWIN TUBE 6,295 12,590
GSP7 5,088 10,176

RECEIVE ONE PROGRAM (01000010b 42h)

SYSX_HEADER 42h yy zz d(1) d(1)' ... d(n) d(n)' EOX

SYSX_HEADER 42h zz d(1)' ... d(n)' EOX (For IPS 33B only)

yy 0000000vb where v is bit 7 of the received program number - 1.
zz 0vvvvvvvb where v is bits 6 through 0 of the received
program number - 1.
d(c) 0000000vb where v is bit 7 of the cth byte of the received program.
d(c)' 0vvvvvvvb where v is bits 6 through 0 of the cth byte of the received

program.

The RECEIVE ONE PROGRAM procedure is used to load a program into the
DigiTech device. The number of program bytes to be received (n) is different
for each DigiTech device.

DigiTech Device # Ram bytes # Midi data bytes

IPS33 4 4
DSP256 38 76
MEQ 28 35 70
MEQ 14 35 70
MEQ 7 35 70
GSP21 61 122
GSP21 PRO 61 122
IPS33B 71 71
DSP256 XL 38 76
GFX-1 TWIN TUBE 49 98
GSP7 52 104

RECEIVE ALL HARMONY DEFINITIONS (01000011b 43h)

SYSX_HEADER 43h 00h d(1) ... d(n) EOX

d(c) 0vvvvvvvb where v is bits 6 through 0 of the cth byte of the harmony
definitions.

The RECEIVE ALL HARMONY DEFINITIONS procedure is used to load all harmony
definitions into the DigiTech device. The number of harmony definition bytes
to be received (n) is different for each DigiTech device.

DigiTech Device # Ram bytes # Midi data bytes

IPS33 384 384
IPS33B 768 768

RECEIVE ONE HARMONY DEFINITION (01000100b 44h)

SYSX_HEADER 44h 00h zz d(1) ... d(n) EOX

zz 0vvvvvvvb where v is bits 6 through 0 of the received harmony definition
number - 1.

d(c) 0vvvvvvvb where v is bits 6 through 0 of the cth byte of the harmony
definition.

The RECEIVE ONE HARMONY DEFINITION procedure is used to load one harmony
definition into the DigiTech device. The number of harmony definition bytes
to be received (n) is different for each DigiTech device.

DigiTech Device # Ram bytes # Midi data bytes

IPS33 24 24
IPS33B 24 24

RECEIVE ALL ARPEGGIO PATTERN DEFINITIONS (01000101b 45h)

SYSX_HEADER 45h 00h d(1) ... d(n) EOX

d(c) 0vvvvvvvb where v is bits 6 through 0 of the cth byte of the arpeggio
pattern definitions.

The RECEIVE ALL ARPEGGIO DEFINITIONS procedure is used to load all arpeggio
pattern definitions into the DigiTech device. The number of arpeggio pattern
definition bytes to be received (n) is different for each DigiTech device.

DigiTech Device # Ram bytes # Midi data bytes

IPS33B 544 544

RECEIVE ONE ARPEGGIO PATTERN DEFINITION (01000110b 46h)

SYSX_HEADER 46h 00h zz d(1) ... d(n) EOX

zz 0vvvvvvvb where v is bits 6 through 0 of the received arpeggio pattern
definition number - 1.

d(c) 0vvvvvvvb where v is bits 6 through 0 of the cth byte of the arpeggio
pattern definition.

The RECEIVE ONE ARPEGGIO DEFINITION procedure is used to load one arpeggio
pattern definition into the DigiTech device. The number of arpeggio pattern
definition bytes to be received (n) is different for each DigiTech device.

DigiTech Device # Ram bytes # Midi data bytes

IPS33B 17 17

RECEIVE RAM AREA (01000111b 47h)

w

m

w

SYSX_HEADER 47h bb ww xx yy zz nn d(1) d(1)'...d(nn) d(nn)' EOX

bb Bank number of ram being received. Currently the only valid bank in
DigiTech devices is 00h.

w 0000000vb where v is bit 15 of the ram address.
xx 0vvvvvvvb where v is bits 14 - 8 of the ram address.
yy 0000000vb where v is bit 7 of the ram address.
zz 0vvvvvvvb where v is bits 6 - 0 of the ram address.
nn 1 to 7Fh, the number of ram bytes being received.
d(c) 0000000vb where v is bit 7 of the cth byte being received.
d(c)' 0vvvvvvvb where v is bits 6 through 0 of the cth byte being sent.

The RECEIVE RAM AREA procedure is used to load an area of a DigiTech
device's internal ram from a host midi device. The Midi Device Manuals for
the DigiTech devices which support the RECEIVE RAM AREA procedure contain a

emory map and definition of the ram locations which may be received.

RECEIVE LARGE RAM AREA (01001000b 48h)

SYSX_HEADER 48h bb ww xx yy zz nn1 nn2 nn3 d(1) d(1)'...d(nn) d(nn)' EOX

bb Bank number of ram being received. Currently the only valid bank in
DigiTech devices is 00h.

w 0000000vb where v is bit 15 of the ram address.
xx 0vvvvvvvb where v is bits 14 - 8 of the ram address.
yy 0000000vb where v is bit 7 of the ram address.
zz 0vvvvvvvb where v is bits 6 - 0 of the ram address.

nn1 0vvvvvvvb where v is bits 6 - 0 of the transfer count.

m

w

nn2 0vvvvvvvb where v is bits 13 - 7 of the transfer count.
nn3 0vvvvvvvb where v is bits 20 - 14 of the transfer count.
d(c) 0000000vb where v is bit 7 of the cth byte being received.
d(c)' 0vvvvvvvb where v is bits 6 through 0 of the cth byte being sent.

The RECEIVE LARGE RAM AREA procedure is used to load an area of a DigiTech
device's internal ram from a host midi device. The Midi Device Manuals for
the DigiTech devices which support the RECEIVE RAM AREA procedure contain a

emory map and definition of the ram locations which may be received.

REQUEST BULK DUMP (01001001b 49h)

SYSX_HEADER 49h EOX

When a REQUEST BULK DUMP procedure is received, the DigiTech device will
respond with a RECEIVE LARGE RAM AREA procedure.

RETURN TO PROGRAM SCREEN (0110000 b 60h)

SYSX_HEADER 60h EOX

When a RETURN TO PROGRAM SCREEN procedure is received, the DigiTech device

ill return to the program screen if it is on an algorithm or parameter
screen.

notes:

1 MIDI Manufacturers Association
5316 W. 57th St.
Los Angeles, California 90056
[phone]
2 The midi specifications for the GSP21 and the GSP21 PRO are identical.
3 The GSP 21's and the IPS 33B's midi data format IS NOT IDENTICAL (but

their MIDI IDs are). Therefore, the GSP 21's and GSP 21 PRO's midi receive
channel must be different than the IPS 33B's midi receive channel if they
are to both be on the same midi system.

=============================================================

DSP256 Midi Implementation

Device type for the DSP256

Device Type = 6 (06h)

DigiTech Procedures recognized by the DSP256

Request Configuration (00h)
Request One Program (01h)
Receive Microcode (40h)
Receive Configuration (41h)
Receive One Program (42h)

Continuous Controller Calculations

Parameter Value = (CC_Value * 2 * (PARAM_MAX + 1))/256

CC_VALUE The value of the continuous controller. (0-127)
PARAM_MAX The maximum value of the parameter the continuous controller is

changing.

Data format for the DSP256 Receive Configuration procedure

Please note that each internal ram byte (d7 - d0) is transmitted as 2 midi
bytes. The first midi byte is 0000000xb where x is d7. The second midi byte
is 0xxxxxxxb where x is d6 - d0. Refer to the Receive Configuration
procedure in the General Midi Implementation Manual for required header
information.

Ram Byte Number Quick Definition

1 - 2048 128 Program names
2049 - 4864 128 Program definitions
4865 - 5458 27 Algorithm definitions
5459 Program number
5460 Midi receive channel
5461 - 5553 Global link table of parameters to continuous controllers
5554 - 5681 Translation table of received midi program number to
DSP256 program number
5682 Send program change flag
5683 Hand controller flag
5684 - 5700 Foot switch function table
5701 - 5717 Foot switch program table
5718 LCD contrast value
Total Number of Internal Ram Bytes Transmitted 5718

Data format for the DSP256 Receive One Program procedure

Please note that each internal ram byte (d7 - d0) is transmitted as 2 midi

A

bytes. The first midi byte is 0000000xb where x is d7. The second midi byte
is 0xxxxxxxb where x is d6 - d0. Refer to the Receive One Program procedure
in the General Midi Implementation Manual for required header information.

Ram Byte Number Quick Definition

1 - 22 Program definition
23 - 38 Program name

Total Number of Internal Ram Bytes Transmitted 38

128 Program names

Each program name is 16 bytes long. (16 * 128 = 2048 Bytes). The character
set for the DSP256 is at the end of this document.

128 Program Definitions

Program Definition has the following structure:

Program
Definition
Byte Definition

1 Algorithm number (0 - 26)
2 - 22 Vary based on the algorithm number.

There are 128 program definitions in the DSP256 (128 * 22 = 2,816 bytes)

The next section defines program definition bytes 2-22 for each of the 27

m
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A

A

A

A

algorithms of the DSP256. The first of each algorithm definition contains
the number of the algorithm and it's name. The algorithm number goes in
program definition byte 1. The remaining lines of the algorithm definition
follow this format:

PDB# Parameter Name min - max

PDB# The Program Definition Byte Number

in The minimum value to which this parameter may be set

ax The maximum value to which this parameter may be set

ll numbers are given in decimal.

full definition of each parameter may be found at the end of this
document.

lgorithm 0
MUTE

2 - 22 Not used, set to 0.

lgorithm 1
Dry

2 - 22 Not used, set to 0.

A

lgorithm 2

A

A

Stereo Chorus

2 Chorus Delay 0-60
3 Chorus LFO Speed 0-65
4 Chorus LFO Depth 0-99
5 Mix:Dry Level 0-10
6 Mix:Chorus R Lvl 0-10
7 Mix:Chorus L Lvl 0-10
8-22 Not used, set to 0

lgorithm 3
Stereo Flange

2 Flange Delay 0-10
3 Flange LFO Speed 0-65
4 Flange LFO Depth 0-99
5 Flange Feedback 0-10
6 Mix:Dry Level 0-10
7 Mix:Flange R Lvl 0-10
8 Mix:Flange L Lvl 0-10
9-22 Not used, set to 0

lgorithm 4
Stereo Delay

2 Delay Time 0-147

A

A

3 Delay Feedback 0-11
4 Mix:Dry Level 0-10
5 Mix:Delay R Levl 0-10
6 Mix:Delay L Levl 0-10
7-22 Not used, set to 0

lgorithm 5
4-Tap Delay

2 Delay Time Tap1 0-222
3 Delay Time Tap2 0-222
4 Delay Time Tap3 0-222
5 Delay Time Tap4 0-222
6 Delay Time Feed 0-222
7 Delay Feedback 0-11
8 Mix:Dry Level 0-10
9 Mix:Tap1 R Level 0-10
10 Mix:Tap1 L Level 0-10
11 Mix:Tap2 R Level 0-10
12 Mix:Tap2 L Level 0-10
13 Mix:Tap3 R Level 0-10
14 Mix:Tap3 L Level 0-10
15 Mix:Tap4 R Level 0-10
16 Mix:Tap4 L Level 0-10
17-22 Not used, set to 0

lgorithm 6
Ultimate Reverb

2 Dry Level 0-10

A

A

3 Early Rflct Levl 0-10
4 Subsequent Level 0-10
5 Norm Reflctivity 0-30
6 Norm Room Volume 0-9
7 Damping Factor 0-9
8 Envelopment 0-9
9 Subsequent Delay 0-70
10 Subsqnt Difusion 0-9
11 Early Delay Time 0-70
12 Early Diffusion 0-9
13-22 Not used, set to 0

lgorithm 7
Gated Reverb

2 Pre-Delay Time 0-80
3 Gate Envelope 0-1
4 Gate Decay Time 0-11
5 Accent Delay 0-10
6 Accent Level 0-10
7 Mix:Dry Level 0-10
8 Mix:Gate R Level 0-10
9 Mix:Gate L Level 0-10
10-22 Not used, set to 0

lgorithm 8
Reverse Reverb

2 Pre-Delay Time 0-80

3 Reverse Time 0-11

A

A

4 Accent Delay 0-10
5 Accent Level 0-10
6 Mix:Dry Level 0-10
7 Mix:Revrse R Lvl 0-10
8 Mix:Revrse L Lvl 0-10
9-22 Not used, set to 0

lgorithm 9
Parametric EQ

2 Band 1 Frequency 0-14
3 Band 1 Level 0-12
4 Band 2 Frequency 0-14
5 Band 2 Level 0-12
6 Band 3 Frequency 0-14
7 Band 3 Level 0-12
8 Mix:EQ Level 0-10
9-22 Not used, set to 0

lgorithm 10
Graphic EQ

2 Graphic 63 Hz 0-12
3 Graphic 125 Hz 0-12
4 Graphic 250 Hz 0-12
5 Graphic 500 Hz 0-12
6 Graphic 1.0 KHz 0-12
7 Graphic 2.0 KHz 0-12
8 Graphic 4.0 KHz 0-12

9 Graphic 8.0 KHz 0-12

A

A

10 Graphic 16 KHz 0-12
11-22 Not used, set to 0

lgorithm 11
Para+Delay+Mixer

2 Band 1 Frequency 0-14
3 Band 1 Level 0-12
4 Band 2 Frequency 0-14
5 Band 2 Level 0-12
6 Band 3 Frequency 0-14
7 Band 3 Level 0-12
8 Delay EQ Source 0-1
9 Delay In:EQ 0-10
10 Delay Time 0-222
11 Delay Feedback 0-11
12 Mix:Dry Level 0-10
13 Mix:EQ Level 0-10
14 Mix:Delay R Levl 0-10
15 Mix:Delay L Levl 0-10
16-22 Not used, set to 0

lgorithm 12
Para+Chorus+Mix

2 Band 1 Frequency 0-14
3 Band 1 Level 0-12
4 Band 2 Frequency 0-14
5 Band 2 Level 0-12

6 Band 3 Frequency 0-14

A

A

7 Band 3 Level 0-12
8 Chorus EQ Source 0-1
9 Chorus Delay 0-60
10 Chorus LFO Speed 0-65
11 Chorus LFO Depth 0-99
12 Mix:Dry Level 0-10
13 Mix:EQ Level 0-10
14 Mix:Chorus R Lvl 0-10
15 Mix:Chorus L Lvl 0-10
16-22 Not used, set to 0

lgorithm 13
Chorus+Room+Mix

2 Chorus Delay 0-60
3 Chorus LFO Speed 0-65
4 Chorus LFO Depth 0-99
5 Reverb In:Dry 0-10
6 Reverb Predelay 0-60
7 Reverb Filter 0-2
8 Reverb Decay 0-11 (A)
9 Mix:Dry Level 0-10
10 Mix:Chorus R Lvl 0-10
11 Mix:Chorus L Lvl 0-10
12 Mix:Reverb R Lvl 0-10
13 Mix:Reverb L Lvl 0-10
14-22 Not used, set to 0

lgorithm 14

Delay+Room+Mixer

A

2 Delay Time 0-147
3 Delay Feedback 0-11
4 Reverb In:Dry 0-10
5 Reverb In:Delay 0-10
6 Reverb Predelay 0-60
7 Reverb Filter 0-2
8 Reverb Decay 0-11 (A)
9 Mix:Dry Level 0-10
10 Mix:Delay R Levl 0-10
11 Mix:Delay L Levl 0-10
12 Mix:Reverb R Lvl 0-10
13 Mix:Reverb L Lvl 0-10
14-22 Not used, set to 0

lgorithm 15
Chorus+Hall+Mix

2 Chorus Delay 0-60
3 Chorus LFO Speed 0-65
4 Chorus LFO Depth 0-99
5 Reverb In:Dry 0-10
6 Reverb In:Chorus 0-10
7 Reverb Predelay 0-60
8 Reverb Filter 0-2
9 Reverb Decay 0-21 (B)
10 Mix:Dry Level 0-10
11 Mix:Chorus R Lvl 0-10
12 Mix:Chorus L Lvl 0-10

13 Mix:Reverb R Lvl 0-10

A

A

14 Mix:Reverb L Lvl 0-10
15-22 Not used, set to 0

lgorithm 16
Delay+Hall+Mixer

2 Delay Time 0-147
3 Delay Feedback 0-11
4 Reverb In:Dry 0-10
5 Reverb In:Delay 0-10
6 Reverb Predelay 0-60
7 Reverb Filter 0-2
8 Reverb Decay 0-21 (B)
9 Mix:Dry Level 0-10
10 Mix:Delay R Lvl 0-10
11 Mix:Delay L Lvl 0-10
12 Mix:Reverb R Lvl 0-10
13 Mix:Reverb L Lvl 0-10
14-22 Not used, set to 0

lgorithm 17
EQ+Gated+Mixer

2 LPF Cut-Off Freq 0-22
3 Pre-Delay Time 0-80
4 Gate Envelope 0-1
5 Gate Decay Time 0-11
6 Accent Delay 0-10
7 Mix:EQ Right 0-10

8 Mix:EQ Left 0-10

A

A

9 Mix:Accent Right 0-10
10 Mix:Accent Left 0-10
11 Mix:Gate Right 0-10
12 Mix:Gate Left 0-10
13-22 Not used, set to 0

lgorithm 18
EQ+Reverse+Mixer

2 LPF Cut-Off Freq 0-22
3 Pre-Delay Time 0-80
4 Reverse Time 0-11
5 Accent Delay 0-10
6 Mix:EQ Right 0-10
7 Mix:EQ Left 0-10
8 Mix:Accent Right 0-10
9 Mix:Accent Left 0-10
10 Mix:Revrse R Lvl 0-10
11 Mix:Revrse L Lvl 0-10
12-22 Not used, set to 0

lgorithm 19
Para+Cho+Dly+Mix

2 Band 1 Frequency 0-14
3 Band 1 Level 0-12
4 Band 2 Frequency 0-14
5 Band 2 Level 0-12

6 Band 3 Frequency 0-14

A

7 Band 3 Level 0-12
8 Chorus EQ Source 0-1
9 Chorus Delay 0-60
10 Chorus LFO Speed 0-65
11 Chorus LFO Depth 0-99
12 Delay EQ Source 0-1
13 Delay In:EQ 0-10
14 Delay In:Chorus 0-10
15 Delay Time 0-222
16 Delay Feedback 0-11
17 Mix:Dry Level 0-10
18 Mix:EQ Level 0-10
19 Mix:Delay R Levl 0-10
20 Mix:Delay L Levl 0-10
21 Mix:Chorus R Lvl 0-10
22 Mix:Chorus L Lvl 0-10

lgorithm 20
Para+Fla+Dly+Mix

2 Band 1 Frequency 0-14
3 Band 1 Level 0-12
4 Band 2 Frequency 0-14
5 Band 2 Level 0-12
6 Band 3 Frequency 0-14
7 Band 3 Level 0-12
8 Flange EQ Source 0-1
9 Flange Delay 0-60
10 Flange LFO Speed 0-65

11 Flange LFO Depth 0-99

A

12 Flange Feedback 0-10
13 Delay EQ Source 0-1
14 Delay In:EQ 0-10
15 Delay In:Flange 0-10
16 Delay Time 0-222
17 Delay Feedback 0-11
18 Mix:EQ Level 0-10
19 Mix:Delay R Levl 0-10
20 Mix:Delay L Levl 0-10
21 Mix:Flange R Lvl 0-10
22 Mix:Flange L Lvl 0-10

lgorithm 21
Cho+Dly+Room+Mix

2 Chorus Delay 0-60
3 Chorus LFO Speed 0-65
4 Chorus LFO Depth 0-99
5 Delay In:Dry 0-10
6 Delay In:Chorus 0-10
7 Delay Time 0-147
8 Delay Feedback 0-11
9 Reverb In:Dry 0-10
10 Reverb In:Chorus 0-10
11 Reverb In:Delay 0-10
12 Reverb Predelay 0-60
13 Reverb Filter 0-2
14 Reverb Decay 0-11 (A)
15 Mix:Dry Level 0-10

16 Mix:Chorus R Lvl 0-10

A

17 Mix:Chorus L Lvl 0-10
18 Mix:Delay R Levl 0-10
19 Mix:Delay L Levl 0-10
20 Mix:Reverb R Lvl 0-10
21 Mix:Reverb L Lvl 0-10
22 Not used, set to 0

lgorithm 22
Fla+Dly+Room+Mix

2 Flange Delay 0-10
3 Flange LFO Speed 0-65
4 Flange LFO Depth 0-99
5 Flange Feedback 0-10
6 Delay In:Dry 0-10
7 Delay In:Flange 0-10
8 Delay Time 0-147
9 Delay Feedback 0-11
10 Reverb In:Dry 0-10
11 Reverb In:Flange 0-10
12 Reverb In:Delay 0-10
13 Reverb Predelay 0-60
14 Reverb Filter 0-2
15 Reverb Decay 0-11 (A)
16 Mix:Dry Level 0-10
17 Mix:Flange R Lvl 0-10
18 Mix:Flange L Lvl 0-10
19 Mix:Delay R Levl 0-10
20 Mix:Delay L Levl 0-10

21 Mix:Reverb R Lvl 0-10

A

A

22 Mix:Reverb L Lvl 0-10

lgorithm 23
Cho+Dly+Hall+Mix

2 Chorus Delay 0-60
3 Chorus LFO Speed 0-65
4 Chorus LFO Depth 0-99
5 Delay In:Dry 0-10
6 Delay In:Chorus 0-10
7 Delay Time 0-147
8 Delay Feedback 0-11
9 Reverb In:Dry 0-10
10 Reverb In:Chorus 0-10
11 Reverb In:Delay 0-10
12 Reverb Predelay 0-60
13 Reverb Filter 0-2
14 Reverb Decay 0-21 (B)
15 Mix:Dry Level 0-10
16 Mix:Chorus R Lvl 0-10
17 Mix:Chorus L Lvl 0-10
18 Mix:Delay R Levl 0-10
19 Mix:Delay L Levl 0-10
20 Mix:Reverb R Lvl 0-10
21 Mix:Reverb L Lvl 0-10
22 Not used, set to 0

lgorithm 24
Fla+Dly+Hall+Mix

2 Flange Delay 0-10

A

3 Flange LFO Speed 0-65
4 Flange LFO Depth 0-99
5 Flange Feedback 0-10
6 Delay In:Dry 0-10
7 Delay In:Flange 0-10
8 Delay Time 0-147
9 Delay Feedback 0-11
10 Reverb In:Dry 0-10
11 Reverb In:Flange 0-10
12 Reverb In:Delay 0-10
13 Reverb Predelay 0-60
14 Reverb Filter 0-2
15 Reverb Decay 0-21 (B)
16 Mix:Dry Level 0-10
17 Mix:Flange R Lvl 0-10
18 Mix:Flange L Lvl 0-10
19 Mix:Delay R Levl 0-10
20 Mix:Delay L Levl 0-10
21 Mix:Reverb R Lvl 0-10
22 Mix:Reverb L Lvl 0-10

lgorithm 25
EQ+Chor+4Tap+Mix

2 LPF Cut-Off Freq 0-22
3 Chorus Dly Time 0-60
4 Chorus LFO Speed 0-65
5 Chorus LFO Depth 0-99

6 Delay In:EQ 0-10

A

7 Delay In:Chorus 0-10
8 Delay Time Tap1 0-222
9 Delay Time Tap2 0-222
10 Delay Time Tap3 0-222
11 Delay Time Tap4 0-222
12 Delay Time Feed 0-222
13 Delay Feedback 0-11
14 Mix:EQ Level 0-10
15 Mix:Chorus Level 0-10
16 Mix:Tap1 R Level 0-10
17 Mix:Tap1 L Level 0-10
18 Mix:Tap2 Level 0-10
19 Mix:Tap3 Level 0-10
20 Mix:Tap4 R Level 0-10
21 Mix:Tap4 L Level 0-10
22 Not used, set to 0

lgorithm 26
EQ+Flan+4Tap+Mix

2 LPF Cut-Off Freq 0-22
3 Flange Dly Time 0-10
4 Flange LFO Speed 0-65
5 Flange LFO Depth 0-99
6 Flange Feedback 0-10
7 Delay In:EQ 0-10
8 Delay In:Flange 0-10
9 Delay Time Tap1 0-222
10 Delay Time Tap2 0-222

11 Delay Time Tap3 0-222
12 Delay Time Tap4 0-222
13 Delay Time Feed 0-222
14 Delay Feedback 0-11
15 Mix:EQ Level 0-10
16 Mix:Flange Level 0-10
17 Mix:Tap1 R Level 0-10
18 Mix:Tap1 L Level 0-10
19 Mix:Tap2 Level 0-10
20 Mix:Tap3 Level 0-10
21 Mix:Tap4 R Level 0-10
22 Mix:Tap4 L Level 0-10

27 Algorithm definitions

Each of the 27 algorithm definitions holds a 22 byte program definition (27
* 22 = 594 bytes). The 1st entry is the latest parameter settings for
algorithm 0, the 2nd entry is the latest parameter settings for algorithm 1,
etc. See Program Definitions for the structure of each of the 27 algorithms.
The DSP256 uses this table while changing a program's algorithm.

Program number (0-255)

Program number + 1 is the program that is running in the DSP256.

Midi receive channel (0 - 17)

0 Receive MIDI Disabled
1-16 Receive MIDI on Channel 1-16
17 Receive MIDI on All Channels

Global link table of parameters to continuous controllers (P2CC)

A

ll parameters in the DSP256 are assigned a parameter number. This number is
used as an offset into the P2CC table. The value of an entry in the P2CC may
be 0 through 129. 0 - 127 correspond to continuous controllers 0 - 127. 128
is Channel Pressure and 129 is NotLinked. The following table lists the
DSP256 parameter number assignments and shows the correspondence between a
byte in the P2CC and a DSP256 parameter.

1 Not Used
2 Flange Delay
3 Flange LFO Speed
4 Flange LFO Depth
5 Flange Feedback
6 Flange EQ Source
7 Mix:Flange R Lvl
8 Mix:Flange L Lvl
9 Chorus Delay
10 Chorus LFO Speed
11 Chorus LFO Depth
12 Chorus EQ Source
13 Mix:Chorus R Lvl
14 Mix:Chorus L Lvl
15 Mix:Dry Level
16 Delay Time
17 Delay Feedback
18 Delay In:Dry
19 Delay In:Flange
20 Delay In:EQ
21 Delay EQ Source
22 Mix:Delay R Levl
23 Mix:Delay L Levl
24 Not Used

25 Delay Time Tap2
26 Delay Time Tap3
27 Delay Time Tap4
28 Delay Time Feed
29 Mix:Tap2 R Level
30 Mix:Tap2 L Level
31 Mix:Tap3 R Level
32 Mix:Tap3 L Level
33 Mix:Tap4 R Level
34 Mix:Tap4 L Level
35 Reverb In:Dry
36 Reverb In:Chorus
37 Reverb In:Delay
38 Reverb Filter
39 Pre-Delay Time
40 Reverb Decay
41 Mix:Reverb R Lvl
42 Mix:Reverb L Lvl
43 Early Rflct Levl
44 Subsequent Level
45 Norm Reflctivity
46 Norm Room Volume
47 Damping Factor
48 Envelopment
49 Subsequent Delay
50 Subsqnt Difusion
51 Early Delay Time
52 Early Diffusion
53 Gate Envelope
54 Mix:Accent Right

55 Mix:Accent Left
56 Band 1 Frequency
57 Band 1 Level
58 Band 2 Frequency
59 Band 2 Level
60 Band 3 Frequency
61 Band 3 Level
62 LPF Cut-Off Freq
63 Mix:EQ Level
64 Graphic 63 Hz
65 Graphic 125 Hz
66 Graphic 250 Hz
67 Graphic 500 Hz
68 Graphic 1.0 KHz
69 Graphic 2.0 KHz
70 Graphic 4.0 KHz
71 Graphic 8.0 KHz
72 Graphic 16 Khz
73 Accent Delay
74 Mix:Flange Level
75 Mix:Chorus Level
76 Dry Level
77 Delay In:Chorus
78 Delay Time Tap1
79 Reverb In:Flange
80 Gate Decay Time
81 Accent Level
82 Mix:Gate R Level
83 Mix:Gate L Level
84 Reverse Time

85 Mix:Revrse R Lvl
86 Mix:Revrse L Lvl
87 Mix:Tap2 Level
88 Mix:Tap3 Level
89 Mix:Tap1 R Level
90 Mix:Tap1 L Level
91 Not Used
92 Bypass
93 Repeat Hold

Translation table of received midi program number to DSP256 program number
(MIDI_TO_PROGRAM)

This 128 byte table is used to translate received midi program numbers to
DSP256 program numbers. The received midi program number is used as an index
into the MIDI_TO_PROGRAM table. The byte at that index is the program number
to change to. Bytes in this table have the value of 0-255.

PROGRAM_NUMBER = MIDI_TO_PROGRAM[received midi program number]

Send program change flag (0-1)

When set to 1, a program change from the hand controller is transmitted on
the receive midi channel. When set to 0, no program changes are generated
from the DSP256.

Hand controller flag (0-1)

Set to 1 if the hand controller is to be used. Set to 0 if the foot switch
is to be used.

Foot switch function table

17 byte table for unique foot switch combinations. The value of a byte in
this table has the following definition:

0 No Function
1 Program Up
2 Program Down
3 Parameter Up
4 Parameter Down
5 Parameter Right
6 Parameter Left
7 Compare
8 Store
9 Name
10 Utility
11 Bypass
12 Repeat Hold
13 Select Program, use corresponding byte in the foot switch program table.

Foot switch program table

17 Byte table that contains the program number to be selected when a foot
switch is configured to Select Program.

LCD contrast value

0 (00h) LCD Contrast 1
16 (10h) LCD Contrast 2
32 (20h) LCD Contrast 3

48 (30h) LCD Contrast 4

A

A

64 (40h) LCD Contrast 5
80 (50h) LCD Contrast 6
96 (60h) LCD Contrast 7
112 (70h) LCD Contrast 8
128 (80h) LCD Contrast 9
144 (90h) LCD Contrast 10

DSP256 Parameters
The DSP256 parameters are listed in alphabetical order. The display value of

the parameter is given if the display value is different then the parameter
value.

ccent Delay (0-10)
0 -50 ms
1 -40 ms
2 -30 ms
3 -20 ms
4 -10 ms
5 0 ms
6 +10 ms
7 +20 ms
8 +30 ms
9 +40 ms
10 +50 ms

ccent Level (0-10)
Band 1 Frequency 0-14)
0 0.10 kHz
1 0.14 kHz
2 0.20 kHz

3 0.28 kHz
4 0.40 kHz
5 0.56 kHz
6 0.80 kHz
7 1.13 kHz
8 1.60 kHz
9 2.26 kHz
10 3.20 kHz
11 4.53 kHz
12 6.40 kHz
13 9.05 kHz
14 12.0 kHz
Band 2 Frequency (0-14)
See Band 1 Frequency
Band 3 Frequency (0-14)
See Band 1 Frequency
Band 1 Level (0-12)
0 -12 dB
1 -10 dB
2 - 8 dB
3 - 6 dB
4 - 4 dB
5 - 2 dB
6 0 dB
7 + 2 dB
8 + 4 dB
9 + 6 dB
10 + 8 dB
11 +10 dB
12 +12 dB

Band 2 Level (0-12)
See Band 1 Level
Band 3 Level (0-12)
See Band 1 Level
Chorus Delay (0-60)
0 0 Millisecs.
. .
60 60 Millisecs.
Chorus Dly Time (0-60)
0 0 Millisecs.
. .
60 60 Millisecs.
Chorus EQ Source (0-1)
0 Pre-EQ
1 Post-EQ
Chorus LFO Speed (0-65)
Chorus LFO Depth (0-99)
Damping Factor (0-9)
0 1
. .
9 10
Delay EQ Source (0-1)
0 Pre-EQ
1 Post-EQ
Delay Feedback (0-11)
0 0 %
1 10 %
2 20 %
3 30 %
4 40 %

5 50 %
6 60 %
7 70 %
8 80 %
9 90 %
10 99 %
11 Repeat Hold
Delay In:Chorus (0-10)
Delay In:Dry (0-10)
Delay In:EQ (0-10)
Delay In:Flange (0-10)
Delay Time (0-222)
0 0.000 Seconds
1 0.001 Seconds
. .
39 0.039 Seconds
40 0.040 Seconds
41 0.045 Seconds
. .
111 0.395 Seconds
112 0.400 Seconds
113 0.410 Seconds
. .
146 0.740 Seconds
147 0.750 Seconds
. .
221 1.490 Seconds
222 1.500 Seconds
Delay Time Feed (0-222)
See Delay Time

Delay Time Tap1 (0-222)
See Delay Time

Delay Time Tap2 (0-222)
See Delay Time
Delay Time Tap3 (0-222)
See Delay Time
Delay Time Tap4 (0-222)
See Delay Time
Dry Level (0-10)
Early Delay Time (0-70)
0 0 Millisecs.
. .
70 70 Millisecs.
Early Diffusion (0-9)
0 1
. .
9 10
Early Rflct Levl (0-10)
Envelopment (0-9)
0 1
. .
9 10
Flange Delay (0-60)
0 0 Millisecs.
. .
60 60 Millisecs.
Flange Dly Time (0-10)
0 0 Millisecs.
. .

10 10 Millisecs.
Flange EQ Source (0-1)
0 Pre-Eq
1 Post-Eq
Flange Feedback (0-10)
0 0 %
1 10 %
2 20 %
3 30 %
4 40 %
5 50 %
6 60 %
7 70 %
8 80 %
9 90 %
10 99 %
Flange LFO Speed (0-65)
Flange LFO Depth (0-99)
Gate Decay Time (0-11)
0 50 ms
1 100 ms
2 150 ms
3 200 ms
4 250 ms
5 300 ms
6 350 ms
7 400 ms
8 450 ms
9 500 ms
10 550 ms

11 600 ms

Gate Envelope (0-1)
0 Flat
1 Decaying
Graphic 63 Hz (0-12)
see Band 1 Level
Graphic 125 Hz (0-12)
See Band 1 Level
Graphic 250 Hz (0-12)
See Band 1 Level
Graphic 500 Hz (0-12)
See Band 1 Level
Graphic 1.0 KHz (0-12)
See Band 1 Level
Graphic 2.0 KHz (0-12)
See Band 1 Level
Graphic 4.0 KHz (0-12)
See Band 1 Level
Graphic 8.0 Khz (0-12)
See Band 1 Level
Graphic 16 Khz (0-12)
See Band 1 Level
LPF Cut-Off Freq (0-22)
0 100 Hz
1 480 Hz
2 570 Hz
3 670 Hz
4 800 Hz
5 950 Hz

6 1.1 kHz
7 1.3 kHz
8 1.6 kHz
9 1.9 kHz
10 2.2 kHz
11 2.6 kHz
12 3.2 kHz
13 3.8 kHz
14 4.5 kHz
15 5.3 kHz
16 6.4 kHz
17 7.6 kHz
18 9.0 kHz
19 10 kHz
20 12 kHz
21 15 kHz
22 18 kHz
Mix:Accent Left (0-10)
Mix:Accent Right (0-10)
Mix:Chorus L Lvl (0-10)
Mix:Chorus Level (0-10)
Mix:Chorus R Lvl (0-10)
Mix:Delay L Levl (0-10)
Mix:Delay R Levl (0-10)
Mix:Dry Level (0-10)
Mix:EQ Left (0-10)
Mix:EQ Level (0-10)
Mix:EQ Right (0-10)
Mix:Flange L Lvl (0-10)
Mix:Flange Level (0-10)

Mix:Flange R Lvl (0-10)
Mix Gate Left (0-10)
Mix Gate Right (0-10)
Mix:Gate L Level (0-10)
Mix:Gate R Level (0-10)
Mix:Reverb L Lvl (0-10)
Mix:Reverb R Lvl (0-10)
Mix:Revrse L Lvl (0-10)
Mix:Revrse R Lvl (0-10)
Mix:Tap1 L Level (0-10)
Mix:Tap1 R Level (0-10)
Mix:Tap2 L Level (0-10)
Mix:Tap2 Level (0-10)
Mix:Tap2 R Level (0-10)
Mix:Tap3 L Level (0-10)
Mix:Tap3 Level (0-10)
Mix:Tap3 R Level (0-10)
Mix:Tap4 L Level (0-10)
Mix:Tap4 R Level (0-10)
Norm Reflctivity (0-10)
0 1.0 Seconds
1 1.2 Seconds
2 1.4 Seconds
3 1.6 Seconds
4 1.9 Seconds
5 2.2 Seconds
6 2.5 Seconds
7 2.9 Seconds
8 3.4 Seconds
9 4.0 Seconds

10 4.6 Seconds
11 5.4 Seconds
12 6.3 Seconds
13 7.4 Seconds
14 8.6 Seconds
15 10 Seconds
16 12 Seconds
17 14 Seconds
18 16 Seconds
19 19 Seconds
20 22 Seconds
21 25 Seconds
22 29 Seconds
23 34 Seconds
24 40 Seconds
25 46 Seconds
26 54 Seconds
27 63 Seconds
28 74 Seconds
29 86 Seconds
30 99 Seconds
Norm Room Volume (0-9)
0 0.1
. .
9 1.0
Pre-Delay Time (0-80)
0 0 Millisecs.
. .
80 80 Millisecs.
Reverb Decay (A) (0-11)

0 100 Millisec.
. .
11 1200 Millisec.
Reverb Decay (B) (0-19)
0 1.00 Seconds
1 1.15 Seconds
2 1.33 Seconds
3 1.53 Seconds
4 1.77 Seconds
5 2.00 Seconds
6 2.35 Seconds
7 2.71 Seconds
8 3.13 Seconds
9 3.61 Seconds
10 4.16 Seconds
11 4.80 Seconds
12 5.54 Seconds
13 6.39 Seconds
14 7.37 Seconds
15 8.50 Seconds
16 9.80 Seconds
17 11.30 Seconds
18 13.00 Seconds
19 15.00 Seconds
20 17.30 Seconds
21 20.00 Seconds
Reverb Filter (0-2)
0 Bright
1 Soft
2 Warm

Reverb In:Chorus (0-10)
Reverb In:Delay (0-10)
Reverb In:Dry (0-10)
Reverb In:Flange (0-10)
Reverb Predelay (0-60)
0 0 Millisecs.
. .
60 60 Millisecs.
Reverse Time (0-11)
0 50 ms
1 100 ms
2 150 ms
3 200 ms
4 250 ms
5 300 ms
6 350 ms
7 400 ms
8 450 ms
9 500 ms
10 550 ms
11 600 ms
Subsequent Delay (0-70)
0 0 Millisecs.
. .
70 70 Millisecs.
Subsqnt Difusion (0-9)
0 1
. .
9 10
Subsequent Level (0-10)

CHARACTER SET

A

00h
01h Scan line 6

02h Scan line 5

03h

04h Scan line 3

05h Scan line 2

06h Scan line 7

07h Scan line 0

20h - 7DH Ascii codes

7Eh

7Fh

0h - FFh Katakana & misc characters

The full character set of the DigiTech display may be found in the Hitachi
Liquid Crystal Display Modules (1987) data book page 37.

=============================================================

DSP256 XL Midi Implementation

Device type for the DSP256 XL

Device Type = 11 (0Bh)

DigiTech Procedures recognized by the DSP256 XL

Request Configuration (00h)
Request One Program (01h)
Receive Microcode (40h)
Receive Configuration (41h)
Receive One Program (42h)

Continuous Controller Calculations

Parameter Value = (CC_Value * 2 * (PARAM_MAX + 1))/256

CC_VALUE The value of the continuous controller. (0-127)
PARAM_MAX The maximum value of the parameter the continuous controller is

changing.

Data format for the DSP256 XL Receive Configuration procedure

Please note that each internal ram byte (d7 - d0) is transmitted as 2 midi
bytes. The first midi byte is 0000000xb where x is d7. The second midi byte
is 0xxxxxxxb where x is d6 - d0. Refer to the Receive Configuration
procedure in the General Midi Implementation Manual for required header
information.

Ram Byte Number Quick Definition

1 - 2048 128 Program names
2049 - 4864 128 Program definitions
4865 - 5480 28 Algorithm definitions
5481 Program number
5482 Midi receive channel
5483 - 5579 Global link table of parameters to continuous controllers
5580 - 5707 Translation table of received midi program number to DSP256 XL

program number
5708 Send program change flag
5709 Hand controller flag
5710 - 5726 Foot switch function table
5727 - 5743 Foot switch program table
5744 LCD contrast value
Total Number of Internal Ram Bytes Transmitted 5744

Data format for the DSP256 XL Receive One Program procedure

Please note that each internal ram byte (d7 - d0) is transmitted as 2 midi
bytes. The first midi byte is 0000000xb where x is d7. The second midi byte
is 0xxxxxxxb where x is d6 - d0. Refer to the Receive One Program procedure
in the General Midi Implementation Manual for required header information.

Ram Byte Number Quick Definition

1 - 22 Program definition

23 - 38 Program name

A

Total Number of Internal Ram Bytes Transmitted 38

128 Program names

Each program name is 16 bytes long. (16 * 128 = 2048 Bytes). The character
set for the DSP256 XL is at the end of this document.

128 Program Definitions

Program Definition has the following structure:

Program
Definition
Byte Definition

1 Algorithm number (0 - 27)
2 - 22 Vary based on the algorithm number.

There are 128 program definitions in the DSP256 XL (128 * 22 = 2,816 bytes)

The next section defines program definition bytes 2-22 for each of the 28
algorithms of the DSP256 XL. The first of each algorithm definition contains
the number of the algorithm and it's name. The algorithm number goes in
program definition byte 1. The remaining lines of the algorithm definition
follow this format:

PDB# Parameter Name min - max

PDB# The Program Definition Byte Number

m

in The minimum value to which this parameter may be set

m

A

A

A

A

A

ax The maximum value to which this parameter may be set

ll numbers are given in decimal.

full definition of each parameter may be found at the end of this
document.

lgorithm 0
MUTE

2-22 Not used, set to 0.

lgorithm 1
Dry

2-22 Not used, set to 0.

lgorithm 2
Stereo Chorus

2 Chorus Delay 0-60
3 Chorus LFO Speed 0-65
4 Chorus LFO Depth 0-99
5 Mix:Dry Level 0-10
6 Mix:Chorus R Lvl 0-10
7 Mix:Chorus L Lvl 0-10
8-22 Not used, set to 0

A

lgorithm 3

A

A

Stereo Flange

2 Flange Delay 0-10
3 Flange LFO Speed 0-65
4 Flange LFO Depth 0-99
5 Flange Feedback 0-10
6 Mix:Dry Level 0-10
7 Mix:Flange R Lvl 0-10
8 Mix:Flange L Lvl 0-10
9-22 Not used, set to 0

lgorithm 4
Stereo Delay

2 Delay Time 0-147
3 Delay Feedback 0-11
4 Mix:Dry Level 0-10
5 Mix:Delay R Levl 0-10
6 Mix:Delay L Levl 0-10
7-22 Not used, set to 0

lgorithm 5
4-Tap Delay

2 Delay Time Tap1 0-222
3 Delay Time Tap2 0-222
4 Delay Time Tap3 0-222
5 Delay Time Tap4 0-222
6 Delay Time Feed 0-222

7 Delay Feedback 0-11

A

A

8 Mix:Dry Level 0-10
9 Mix:Tap1 R Level 0-10
10 Mix:Tap1 L Level 0-10
11 Mix:Tap2 R Level 0-10
12 Mix:Tap2 L Level 0-10
13 Mix:Tap3 R Level 0-10
14 Mix:Tap3 L Level 0-10
15 Mix:Tap4 R Level 0-10
16 Mix:Tap4 L Level 0-10
17-22 Not used, set to 0

lgorithm 6
Ultimate Reverb

2 Dry Level 0-10
3 Early Rflct Levl 0-10
4 Subsequent Level 0-10
5 Norm Reflctivity 0-30
6 Norm Room Volume 0-9
7 Damping Factor 0-9
8 Envelopment 0-9
9 Subsequent Delay 0-70
10 Subsqnt Difusion 0-9
11 Early Delay Time 0-70
12 Early Diffusion 0-9
13-22 Not used, set to 0

lgorithm 7
Room Simulator

2 Room Size 0-4

A

A

3 Decay Time 0-23
4 Position 0-2
5 Damping Factor 0-9
6 Reverb Level 0-10
7 Dry Level 0-10
8-22 Not used, set to 0

lgorithm 8
Gated Reverb

2 Pre-Delay Time 0-80
3 Gate Envelope 0-1
4 Gate Decay Time 0-11
5 Accent Delay 0-10
6 Accent Level 0-10
7 Mix:Dry Level 0-10
8 Mix:Gate R Level 0-10
9 Mix:Gate L Level 0-10
10-22 Not used, set to 0

lgorithm 9
Reverse Reverb

2 Pre-Delay Time 0-80
3 Reverse Time 0-11
4 Accent Delay 0-10
5 Accent Level 0-10
6 Mix:Dry Level 0-10

7 Mix:Revrse R Lvl 0-10

A

A

8 Mix:Revrse L Lvl 0-10
9-22 Not used, set to 0

lgorithm 10
Parametric EQ

2 Band 1 Frequency 0-14
3 Band 1 Level 0-12
4 Band 2 Frequency 0-14
5 Band 2 Level 0-12
6 Band 3 Frequency 0-14
7 Band 3 Level 0-12
8 Mix:EQ Level 0-10
9-22 Not used, set to 0

lgorithm 11
Graphic EQ

2 Graphic 63 Hz 0-12
3 Graphic 125 Hz 0-12
4 Graphic 250 Hz 0-12
5 Graphic 500 Hz 0-12
6 Graphic 1.0 KHz 0-12
7 Graphic 2.0 KHz 0-12
8 Graphic 4.0 KHz 0-12
9 Graphic 8.0 KHz 0-12
10 Graphic 16 KHz 0-12
11-22 Not used, set to 0

A

lgorithm 12

A

Para+Delay+Mixer

2 Band 1 Frequency 0-14
3 Band 1 Level 0-12
4 Band 2 Frequency 0-14
5 Band 2 Level 0-12
6 Band 3 Frequency 0-14
7 Band 3 Level 0-12
8 Delay EQ Source 0-1
9 Delay In:EQ 0-10
10 Delay Time 0-222
11 Delay Feedback 0-11
12 Mix:Dry Level 0-10
13 Mix:EQ Level 0-10
14 Mix:Delay R Levl 0-10
15 Mix:Delay L Levl 0-10
16-22 Not used, set to 0

lgorithm 13
Para+Chorus+Mix

2 Band 1 Frequency 0-14
3 Band 1 Level 0-12
4 Band 2 Frequency 0-14
5 Band 2 Level 0-12
6 Band 3 Frequency 0-14
7 Band 3 Level 0-12
8 Chorus EQ Source 0-1
9 Chorus Delay 0-60

10 Chorus LFO Speed 0-65

A

A

11 Chorus LFO Depth 0-99
12 Mix:Dry Level 0-10
13 Mix:EQ Level 0-10
14 Mix:Chorus R Lvl 0-10
15 Mix:Chorus L Lvl 0-10
16-22 Not used, set to 0

lgorithm 14
Chorus+Room+Mix

2 Chorus Delay 0-60
3 Chorus LFO Speed 0-65
4 Chorus LFO Depth 0-99
5 Reverb In:Dry 0-10
6 Reverb Predelay 0-60
7 Reverb Filter 0-2
8 Reverb Decay 0-11 (A)
9 Mix:Dry Level 0-10
10 Mix:Chorus R Lvl 0-10
11 Mix:Chorus L Lvl 0-10
12 Mix:Reverb R Lvl 0-10
13 Mix:Reverb L Lvl 0-10
14-22 Not used, set to 0

lgorithm 15
Delay+Room+Mixer

2 Delay Time 0-147
3 Delay Feedback 0-11

4 Reverb In:Dry 0-10

A

5 Reverb In:Delay 0-10
6 Reverb Predelay 0-60
7 Reverb Filter 0-2
8 Reverb Decay 0-11 (A)
9 Mix:Dry Level 0-10
10 Mix:Delay R Levl 0-10
11 Mix:Delay L Levl 0-10
12 Mix:Reverb R Lvl 0-10
13 Mix:Reverb L Lvl 0-10
14-22 Not used, set to 0

lgorithm 16
Chorus+Hall+Mix

2 Chorus Delay 0-60
3 Chorus LFO Speed 0-65
4 Chorus LFO Depth 0-99
5 Reverb In:Dry 0-10
6 Reverb In:Chorus 0-10
7 Reverb Predelay 0-60
8 Reverb Filter 0-2
9 Reverb Decay 0-21 (B)
10 Mix:Dry Level 0-10
11 Mix:Chorus R Lvl 0-10
12 Mix:Chorus L Lvl 0-10
13 Mix:Reverb R Lvl 0-10
14 Mix:Reverb L Lvl 0-10
15-22 Not used, set to 0

A

lgorithm 17

A

Delay+Hall+Mixer

2 Delay Time 0-147
3 Delay Feedback 0-11
4 Reverb In:Dry 0-10
5 Reverb In:Delay 0-10
6 Reverb Predelay 0-60
7 Reverb Filter 0-2
8 Reverb Decay 0-21 (B)
9 Mix:Dry Level 0-10
10 Mix:Delay R Lvl 0-10
11 Mix:Delay L Lvl 0-10
12 Mix:Reverb R Lvl 0-10
13 Mix:Reverb L Lvl 0-10
14-22 Not used, set to 0

lgorithm 18
EQ+Gated+Mixer

2 LPF Cut-Off Freq 0-22
3 Pre-Delay Time 0-80
4 Gate Envelope 0-1
5 Gate Decay Time 0-11
6 Accent Delay 0-10
7 Mix:EQ Right 0-10
8 Mix:EQ Left 0-10
9 Mix:Accent Right 0-10
10 Mix:Accent Left 0-10
11 Mix:Gate Right 0-10

12 Mix:Gate Left 0-10

A

A

13-22 Not used, set to 0

lgorithm 19
EQ+Reverse+Mixer

2 LPF Cut-Off Freq 0-22
3 Pre-Delay Time 0-80
4 Reverse Time 0-11
5 Accent Delay 0-10
6 Mix:EQ Right 0-10
7 Mix:EQ Left 0-10
8 Mix:Accent Right 0-10
9 Mix:Accent Left 0-10
10 Mix:Revrse R Lvl 0-10
11 Mix:Revrse L Lvl 0-10
12-22 Not used, set to 0

lgorithm 20
Para+Cho+Dly+Mix

2 Band 1 Frequency 0-14
3 Band 1 Level 0-12
4 Band 2 Frequency 0-14
5 Band 2 Level 0-12
6 Band 3 Frequency 0-14
7 Band 3 Level 0-12
8 Chorus EQ Source 0-1
9 Chorus Delay 0-60
10 Chorus LFO Speed 0-65

11 Chorus LFO Depth 0-99

A

12 Delay EQ Source 0-1
13 Delay In:EQ 0-10
14 Delay In:Chorus 0-10
15 Delay Time 0-222
16 Delay Feedback 0-11
17 Mix:Dry Level 0-10
18 Mix:EQ Level 0-10
19 Mix:Delay R Levl 0-10
20 Mix:Delay L Levl 0-10
21 Mix:Chorus R Lvl 0-10
22 Mix:Chorus L Lvl 0-10

lgorithm 21
Para+Fla+Dly+Mix

2 Band 1 Frequency 0-14
3 Band 1 Level 0-12
4 Band 2 Frequency 0-14
5 Band 2 Level 0-12
6 Band 3 Frequency 0-14
7 Band 3 Level 0-12
8 Flange EQ Source 0-1
9 Flange Delay 0-60
10 Flange LFO Speed 0-65
11 Flange LFO Depth 0-99
12 Flange Feedback 0-10
13 Delay EQ Source 0-1
14 Delay In:EQ 0-10
15 Delay In:Flange 0-10

16 Delay Time 0-222

A

17 Delay Feedback 0-11
18 Mix:EQ Level 0-10
19 Mix:Delay R Levl 0-10
20 Mix:Delay L Levl 0-10
21 Mix:Flange R Lvl 0-10
22 Mix:Flange L Lvl 0-10

lgorithm 22
Cho+Dly+Room+Mix

2 Chorus Delay 0-60
3 Chorus LFO Speed 0-65
4 Chorus LFO Depth 0-99
5 Delay In:Dry 0-10
6 Delay In:Chorus 0-10
7 Delay Time 0-147
8 Delay Feedback 0-11
9 Reverb In:Dry 0-10
10 Reverb In:Chorus 0-10
11 Reverb In:Delay 0-10
12 Reverb Predelay 0-60
13 Reverb Filter 0-2
14 Reverb Decay 0-11 (A)
15 Mix:Dry Level 0-10
16 Mix:Chorus R Lvl 0-10
17 Mix:Chorus L Lvl 0-10
18 Mix:Delay R Levl 0-10
19 Mix:Delay L Levl 0-10
20 Mix:Reverb R Lvl 0-10

21 Mix:Reverb L Lvl 0-10

A

A

22 Not used, set to 0

lgorithm 23
Fla+Dly+Room+Mix

2 Flange Delay 0-10
3 Flange LFO Speed 0-65
4 Flange LFO Depth 0-99
5 Flange Feedback 0-10
6 Delay In:Dry 0-10
7 Delay In:Flange 0-10
8 Delay Time 0-147
9 Delay Feedback 0-11
10 Reverb In:Dry 0-10
11 Reverb In:Flange 0-10
12 Reverb In:Delay 0-10
13 Reverb Predelay 0-60
14 Reverb Filter 0-2
15 Reverb Decay 0-11 (A)
16 Mix:Dry Level 0-10
17 Mix:Flange R Lvl 0-10
18 Mix:Flange L Lvl 0-10
19 Mix:Delay R Levl 0-10
20 Mix:Delay L Levl 0-10
21 Mix:Reverb R Lvl 0-10
22 Mix:Reverb L Lvl 0-10

lgorithm 24
Cho+Dly+Hall+Mix

2 Chorus Delay 0-60

A

3 Chorus LFO Speed 0-65
4 Chorus LFO Depth 0-99
5 Delay In:Dry 0-10
6 Delay In:Chorus 0-10
7 Delay Time 0-147
8 Delay Feedback 0-11
9 Reverb In:Dry 0-10
10 Reverb In:Chorus 0-10
11 Reverb In:Delay 0-10
12 Reverb Predelay 0-60
13 Reverb Filter 0-2
14 Reverb Decay 0-21 (B)
15 Mix:Dry Level 0-10
16 Mix:Chorus R Lvl 0-10
17 Mix:Chorus L Lvl 0-10
18 Mix:Delay R Levl 0-10
19 Mix:Delay L Levl 0-10
20 Mix:Reverb R Lvl 0-10
21 Mix:Reverb L Lvl 0-10
22 Not used, set to 0

lgorithm 25
Fla+Dly+Hall+Mix

2 Flange Delay 0-10
3 Flange LFO Speed 0-65
4 Flange LFO Depth 0-99
5 Flange Feedback 0-10

6 Delay In:Dry 0-10

A

7 Delay In:Flange 0-10
8 Delay Time 0-147
9 Delay Feedback 0-11
10 Reverb In:Dry 0-10
11 Reverb In:Flange 0-10
12 Reverb In:Delay 0-10
13 Reverb Predelay 0-60
14 Reverb Filter 0-2
15 Reverb Decay 0-21 (B)
16 Mix:Dry Level 0-10
17 Mix:Flange R Lvl 0-10
18 Mix:Flange L Lvl 0-10
19 Mix:Delay R Levl 0-10
20 Mix:Delay L Levl 0-10
21 Mix:Reverb R Lvl 0-10
22 Mix:Reverb L Lvl 0-10

lgorithm 26
EQ+Chor+4Tap+Mix

2 LPF Cut-Off Freq 0-22
3 Chorus Dly Time 0-60
4 Chorus LFO Speed 0-65
5 Chorus LFO Depth 0-99
6 Delay In:EQ 0-10
7 Delay In:Chorus 0-10
8 Delay Time Tap1 0-222
9 Delay Time Tap2 0-222
10 Delay Time Tap3 0-222

11 Delay Time Tap4 0-222

A

12 Delay Time Feed 0-222
13 Delay Feedback 0-11
14 Mix:EQ Level 0-10
15 Mix:Chorus Level 0-10
16 Mix:Tap1 R Level 0-10
17 Mix:Tap1 L Level 0-10
18 Mix:Tap2 Level 0-10
19 Mix:Tap3 Level 0-10
20 Mix:Tap4 R Level 0-10
21 Mix:Tap4 L Level 0-10
22 Not used, set to 0

lgorithm 27
EQ+Flan+4Tap+Mix

2 LPF Cut-Off Freq 0-22
3 Flange Dly Time 0-10
4 Flange LFO Speed 0-65
5 Flange LFO Depth 0-99
6 Flange Feedback 0-10
7 Delay In:EQ 0-10
8 Delay In:Flange 0-10
9 Delay Time Tap1 0-222
10 Delay Time Tap2 0-222
11 Delay Time Tap3 0-222
12 Delay Time Tap4 0-222
13 Delay Time Feed 0-222
14 Delay Feedback 0-11
15 Mix:EQ Level 0-10

16 Mix:Flange Level 0-10

A
m

17 Mix:Tap1 R Level 0-10
18 Mix:Tap1 L Level 0-10
19 Mix:Tap2 Level 0-10
20 Mix:Tap3 Level 0-10
21 Mix:Tap4 R Level 0-10
22 Mix:Tap4 L Level 0-10

28 Algorithm definitions

Each of the 28 algorithm definitions holds a 22 byte program definition (28
* 22 = 616 bytes). The 1st entry is the latest parameter settings for
algorithm 0, the 2nd entry is the latest parameter settings for algorithm 1,
etc. See Program Definitions for the structure of each of the 28 algorithms.
The DSP256 XL uses this table while changing a program's algorithm.

Program number (0-255)

Program number + 1 is the program that is running in the DSP256 XL.

Midi receive channel (0 - 17)

0 Receive MIDI Disabled
1-16 Receive MIDI on Channel 1-16
17 Receive MIDI on All Channels

Global link table of parameters to continuous controllers (P2CC)

ll parameters in the DSP256 XL are assigned a parameter number. This number
is used as an offset into the P2CC table. The value of an entry in the P2CC

ay be 0 through 129. 0 - 127 correspond to continuous controllers 0 - 127.
128 is Channel Pressure and 129 is NotLinked. The following table lists the

DSP256 XL parameter number assignments and shows the correspondence between
a byte in the P2CC and a DSP256 XL parameter.

1 Not Used
2 Flange Delay
3 Flange LFO Speed
4 Flange LFO Depth
5 Flange Feedback
6 Flange EQ Source
7 Mix:Flange R Lvl
8 Mix:Flange L Lvl
9 Chorus Delay
10 Chorus LFO Speed
11 Chorus LFO Depth
12 Chorus EQ Source
13 Mix:Chorus R Lvl
14 Mix:Chorus L Lvl
15 Mix:Dry Level
16 Delay Time
17 Delay Feedback
18 Delay In:Dry
19 Delay In:Flange
20 Delay In:EQ
21 Delay EQ Source
22 Mix:Delay R Levl
23 Mix:Delay L Levl
24 Not Used
25 Delay Time Tap2
26 Delay Time Tap3
27 Delay Time Tap4
28 Delay Time Feed

29 Mix:Tap2 R Level
30 Mix:Tap2 L Level
31 Mix:Tap3 R Level
32 Mix:Tap3 L Level
33 Mix:Tap4 R Level
34 Mix:Tap4 L Level
35 Reverb In:Dry
36 Reverb In:Chorus
37 Reverb In:Delay
38 Reverb Filter
39 Pre-Delay Time
40 Reverb Decay
41 Mix:Reverb R Lvl
42 Mix:Reverb L Lvl
43 Early Rflct Levl
44 Subsequent Level
45 Norm Reflctivity
46 Norm Room Volume
47 Damping Factor
48 Envelopment
49 Subsequent Delay
50 Subsqnt Difusion
51 Early Delay Time
52 Early Diffusion
53 Gate Envelope
54 Mix:Accent Right
55 Mix:Accent Left
56 Band 1 Frequency
57 Band 1 Level
58 Band 2 Frequency

59 Band 2 Level
60 Band 3 Frequency
61 Band 3 Level
62 LPF Cut-Off Freq
63 Mix:EQ Level
64 Graphic 63 Hz
65 Graphic 125 Hz
66 Graphic 250 Hz
67 Graphic 500 Hz
68 Graphic 1.0 KHz
69 Graphic 2.0 KHz
70 Graphic 4.0 KHz
71 Graphic 8.0 KHz
72 Graphic 16 Khz
73 Accent Delay
74 Mix:Flange Level
75 Mix:Chorus Level
76 Dry Level
77 Delay In:Chorus
78 Delay Time Tap1
79 Reverb In:Flange
80 Gate Decay Time
81 Accent Level
82 Mix:Gate R Level
83 Mix:Gate L Level
84 Reverse Time
85 Mix:Revrse R Lvl
86 Mix:Revrse L Lvl
87 Mix:Tap2 Level
88 Mix:Tap3 Level

89 Mix:Tap1 R Level
90 Mix:Tap1 L Level
91 Room Size
92 Decay Time
93 Position
94 Not Used
95 Reverb Level
96 Bypass
97 Repeat Hold

Translation table of received midi program number to DSP256 XL program
number (MIDI_TO_PROGRAM)

This 128 byte table is used to translate received midi program numbers to
DSP256 XL program numbers. The received midi program number is used as an
index into the MIDI_TO_PROGRAM table. The byte at that index is the program
number to change to. Bytes in this table have the value of 0-255.

PROGRAM_NUMBER = MIDI_TO_PROGRAM[received midi program number]

Send program change flag (0-1)

When set to 1, a program change from the hand controller is transmitted on
the receive midi channel. When set to 0, no program changes are generated
from the DSP256 XL.

Hand controller flag (0-1)

Set to 1 if the hand controller is to be used. Set to 0 if the foot switch
is to be used.

Foot switch function table

17 byte table for unique foot switch combinations. The value of a byte in
this table has the following definition:

0 No Function
1 Program Up
2 Program Down
3 Parameter Up
4 Parameter Down
5 Parameter Right
6 Parameter Left
7 Compare
8 Store
9 Name
10 Utility
11 Bypass
12 Repeat Hold
13 Select Program, use corresponding byte in the foot switch program table.

Foot switch program table

17 Byte table that contains the program number to be selected when a foot
switch is configured to Select Program.

LCD contrast value

0 (00h) LCD Contrast 1
16 (10h) LCD Contrast 2
32 (20h) LCD Contrast 3

48 (30h) LCD Contrast 4

A

A

64 (40h) LCD Contrast 5
80 (50h) LCD Contrast 6
96 (60h) LCD Contrast 7
112 (70h) LCD Contrast 8
128 (80h) LCD Contrast 9
144 (90h) LCD Contrast 10

DSP256XL Parameters
The DSP256XL parameters are listed in alphabetical order. The display value

of the parameter is given if the display value is different then the
parameter value.

ccent Delay (0-10)
0 -50 ms
1 -40 ms
2 -30 ms
3 -20 ms
4 -10 ms
5 0 ms
6 +10 ms
7 +20 ms
8 +30 ms
9 +40 ms
10 +50 ms

ccent Level (0-10)
Band 1 Frequency (0-14)
0 0.10 kHz
1 0.14 kHz
2 0.20 kHz

3 0.28 kHz
4 0.40 kHz
5 0.56 kHz
6 0.80 kHz
7 1.13 kHz
8 1.60 kHz
9 2.26 kHz
10 3.20 kHz
11 4.53 kHz
12 6.40 kHz
13 9.05 kHz
14 12.0 kHz
Band 2 Frequency (0-14)
See Band 1 Frequency
Band 3 Frequency (0-14)
See Band 1 Frequency
Band 1 Level (0-12)
0 -12 dB
1 -10 dB
2 - 8 dB
3 - 6 dB
4 - 4 dB
5 - 2 dB
6 0 dB
7 + 2 dB
8 + 4 dB
9 + 6 dB
10 + 8 dB
11 +10 dB
12 +12 dB

Band 2 Level (0-12)
See Band 1 Level
Band 3 Level (0-12)
See Band 1 Level
Chorus Delay (0-60)
0 0 Millisecs.
. .
60 60 Millisecs.
Chorus Dly Time (0-60)
0 0 Millisecs.
. .
60 60 Millisecs.
Chorus EQ Source (0-1)
0 Pre-EQ
1 Post-EQ
Chorus LFO Speed (0-65)
Chorus LFO Depth (0-99)
Damping Factor (0-9)
0 1
. .
9 10
Decay Time (0-23)
Room Size = Studio
0 .20 Seconds
1 .24 Seconds
2 .28 Seconds
3 .32 Seconds
4 .40 Seconds
5 .45 Seconds
6 .50 Seconds

7 .60 Seconds
8 .70 Seconds
9 .80 Seconds
10 .90 Seconds
11 1.00 Seconds
12 1.30 Seconds
13 1.50 Seconds
14 1.70 Seconds
15 2.00 Seconds
16 2.40 Seconds
17 2.80 Seconds
18 3.20 Seconds
19 3.80 Seconds
20 4.40 Seconds
21 5.00 Seconds
22 5.80 Seconds
23 6.80 Seconds
Room Size = Chamber
0 .30 Seconds
1 .35 Seconds
2 .40 Seconds
3 .50 Seconds
4 .55 Seconds
5 .65 Seconds
6 .75 Seconds
7 .85 Seconds
8 1.00 Seconds
9 1.20 Seconds
10 1.40 Seconds
11 1.60 Seconds

12 1.90 Seconds
13 2.20 Seconds
14 2.60 Seconds
15 3.00 Seconds
16 3.60 Seconds
17 4.20 Seconds
18 4.80 Seconds
19 5.70 Seconds
20 6.60 Seconds
21 7.50 Seconds
22 8.70 Seconds
23 10.20 Seconds
Room Size = Club
0 .50 Seconds
1 .60 Seconds
2 .70 Seconds
3 .80 Seconds
4 1.00 Seconds
5 1.10 Seconds
6 1.30 Seconds
7 1.50 Seconds
8 1.70 Seconds
9 2.00 Seconds
10 2.30 Seconds
11 2.70 Seconds
12 3.20 Seconds
13 3.70 Seconds
14 4.30 Seconds
15 5.00 Seconds
16 6.00 Seconds

17 7.00 Seconds
18 8.00 Seconds
19 9.50 Seconds
20 11.00 Seconds
21 12.50 Seconds
22 14.50 Seconds
23 17.00 Seconds
Room Size = Hall
0 .70 Seconds
1 .80 Seconds
2 1.00 Seconds
3 1.10 Seconds
4 1.30 Seconds
5 1.50 Seconds
6 1.80 Seconds
7 2.00 Seconds
8 2.40 Seconds
9 2.80 Seconds
10 3.20 Seconds
11 3.80 Seconds
12 4.40 Seconds
13 5.20 Seconds
14 6.00 Seconds
15 7.00 Seconds
16 8.40 Seconds
17 9.80 Seconds
18 11.20 Seconds
19 13.30 Seconds
20 15.40 Seconds
21 17.50 Seconds

22 20.30 Seconds
23 23.80 Seconds

Room Size = Arena
0 1.00 Seconds
1 1.20 Seconds
2 1.40 Seconds
3 1.60 Seconds
4 1.90 Seconds
5 2.20 Seconds
6 2.50 Seconds
7 2.90 Seconds
8 3.40 Seconds
9 4.00 Seconds
10 4.60 Seconds
11 5.40 Seconds
12 6.30 Seconds
13 7.40 Seconds
14 8.60 Seconds
15 10.00 Seconds
16 12.00 Seconds
17 14.00 Seconds
18 16.00 Seconds
19 19.00 Seconds
20 22.00 Seconds
21 25.00 Seconds
22 29.00 Seconds
23 34.00 Seconds
Delay EQ Source (0-1)
0 Pre-EQ

1 Post-EQ
Delay Feedback (0-11)
0 0 %
1 10 %
2 20 %
3 30 %
4 40 %
5 50 %
6 60 %
7 70 %
8 80 %
9 90 %
10 99 %
11 Repeat Hold
Delay In:Chorus (0-10)
Delay In:Dry (0-10)
Delay In:EQ (0-10)
Delay In:Flange (0-10)
Delay Time (0-222)
0 0.000 Seconds
1 0.001 Seconds
. .
39 0.039 Seconds
40 0.040 Seconds
41 0.045 Seconds
. .
111 0.395 Seconds
112 0.400 Seconds
113 0.410 Seconds
. .

146 0.740 Seconds
147 0.750 Seconds
. .
221 1.490 Seconds
222 1.500 Seconds
Delay Time Feed (0-222)
See Delay Time
Delay Time Tap1 (0-222)
See Delay Time
Delay Time Tap2 (0-222)
See Delay Time
Delay Time Tap3 (0-222)
See Delay Time
Delay Time Tap4 (0-222)
See Delay Time
Dry Level (0-10)
Early Delay Time (0-70)
0 0 Millisecs.
. .
70 70 Millisecs.
Early Diffusion (0-9)
0 1
. .
9 10
Early Rflct Levl (0-10)
Envelopment (0-9)
0 1
. .
9 10
Flange Delay (0-60)

0 0 Millisecs.
. .
60 60 Millisecs.
Flange Dly Time (0-10)
0 0 Millisecs.
. .
10 10 Millisecs.
Flange EQ Source (0-1)
0 Pre-Eq
1 Post-Eq
Flange Feedback (0-10)
0 0 %
1 10 %
2 20 %
3 30 %
4 40 %
5 50 %
6 60 %
7 70 %
8 80 %
9 90 %
10 99 %
Flange LFO Speed (0-65)
Flange LFO Depth (0-99)
Gate Decay Time (0-11)
0 50 ms
1 100 ms
2 150 ms
3 200 ms
4 250 ms

5 300 ms
6 350 ms
7 400 ms
8 450 ms
9 500 ms
10 550 ms
11 600 ms
Gate Envelope (0-1)
0 Flat
1 Decaying
Graphic 63 Hz (0-12)
See Band 1 Level
Graphic 125 Hz (0-12)
See Band 1 Level
Graphic 250 Hz (0-12)
See Band 1 Level
Graphic 500 Hz (0-12)
See Band 1 Level
Graphic 1.0 KHz (0-12)
See Band 1 Level
Graphic 2.0 KHz (0-12)
See Band 1 Level
Graphic 4.0 KHz (0-12)
See Band 1 Level
Graphic 8.0 Khz (0-12)
See Band 1 Level
Graphic 16 Khz (0-12)
See Band 1 Level
LPF Cut-Off Freq (0-22)
0 100 Hz

1 480 Hz
2 570 Hz
3 670 Hz
4 800 Hz
5 950 Hz
6 1.1 kHz
7 1.3 kHz
8 1.6 kHz
9 1.9 kHz
10 2.2 kHz
11 2.6 kHz
12 3.2 kHz
13 3.8 kHz
14 4.5 kHz
15 5.3 kHz
16 6.4 kHz
17 7.6 kHz
18 9.0 kHz
19 10 kHz
20 12 kHz
21 15 kHz
22 18 kHz
Mix:Accent Left (0-10)
Mix:Accent Right (0-10)
Mix:Chorus L Lvl (0-10)
Mix:Chorus Level (0-10)
Mix:Chorus R Lvl (0-10)
Mix:Delay L Levl (0-10)
Mix:Delay R Levl (0-10)
Mix:Dry Level (0-10)

Mix:EQ Left (0-10)
Mix:EQ Level (0-10)
Mix:EQ Right (0-10)
Mix:Flange L Lvl (0-10)
Mix:Flange Level (0-10)
Mix:Flange R Lvl (0-10)
Mix Gate Left (0-10)
Mix Gate Right (0-10)
Mix:Gate L Level (0-10)
Mix:Gate R Level (0-10)
Mix:Reverb L Lvl (0-10)
Mix:Reverb R Lvl (0-10)
Mix:Revrse L Lvl (0-10)
Mix:Revrse R Lvl (0-10)
Mix:Tap1 L Level (0-10)
Mix:Tap1 R Level (0-10)
Mix:Tap2 L Level (0-10)
Mix:Tap2 Level (0-10)
Mix:Tap2 R Level (0-10)
Mix:Tap3 L Level (0-10)
Mix:Tap3 Level (0-10)
Mix:Tap3 R Level (0-10)
Mix:Tap4 L Level (0-10)
Mix:Tap4 R Level (0-10)
Norm Reflctivity (0-30)
0 1.0 Seconds
1 1.2 Seconds
2 1.4 Seconds
3 1.6 Seconds
4 1.9 Seconds

5 2.2 Seconds
6 2.5 Seconds
7 2.9 Seconds
8 3.4 Seconds
9 4.0 Seconds
10 4.6 Seconds
11 5.4 Seconds
12 6.3 Seconds
13 7.4 Seconds
14 8.6 Seconds
15 10 Seconds
16 12 Seconds
17 14 Seconds
18 16 Seconds
19 19 Seconds
20 22 Seconds
21 25 Seconds
22 29 Seconds
23 34 Seconds
24 40 Seconds
25 46 Seconds
26 54 Seconds
27 63 Seconds
28 74 Seconds
29 86 Seconds
30 99 Seconds
Norm Room Volume (0-9)
0 0.1
. .
9 1.0

Position (0-2)
0 Near
1 Mid
2 Far
Pre-Delay Time (0-80)
0 0 Millisecs.
. .
80 80 Millisecs.
Reverb Decay (A) (0-11)
0 100 Millisec.
. .
11 1200 Millisec.
Reverb Decay (B) (0-21)
0 1.00 Seconds
1 1.15 Seconds
2 1.33 Seconds
3 1.53 Seconds
4 1.77 Seconds
5 2.00 Seconds
6 2.35 Seconds
7 2.71 Seconds
8 3.13 Seconds
9 3.61 Seconds
10 4.16 Seconds
11 4.80 Seconds
12 5.54 Seconds
13 6.39 Seconds
14 7.37 Seconds
15 8.50 Seconds

16 9.80 Seconds
17 11.30 Seconds
18 13.00 Seconds
19 15.00 Seconds
20 17.30 Seconds
21 20.00 Seconds
Reverb Filter (0-2)
0 Bright
1 Soft
2 Warm
Reverb In:Chorus (0-10)
Reverb In:Delay (0-10)
Reverb In:Dry (0-10)
Reverb In:Flange (0-10)
Reverb Level (0-10)
Reverb Predelay (0-60)
0 0 Millisecs.
. .
60 60 Millisecs.

Reverse Time (0-11)
0 50 ms
1 100 ms
2 150 ms
3 200 ms
4 250 ms
5 300 ms
6 350 ms
7 400 ms
8 450 ms

9 500 ms
10 550 ms
11 600 ms
Room Size (0-4)
0 Studio
1 Chamber
2 Club
3 Hall
4 Arena
Subsequent Delay (0-70)
0 0 Millisecs.
. .
70 70 Millisecs.
Subsqnt Difusion (0-9)
0 1
. .
9 10
Subsequent Level (0-10)

CHARACTER SET

00h
01h Scan line 6

02h Scan line 5

03h

A

04h Scan line 3

05h Scan line 2

06h Scan line 7

07h Scan line 0

20h - 7DH Ascii codes

7Eh

7Fh

0h - FFh Katakana & misc characters

The full character set of the DigiTech display may be found in the Hitachi
Liquid Crystal Display Modules (1987) data book page 37.

=============================================================

GSP21 and GSP21 PRO Midi Implementation

Device type for the GSP21 and the GSP21 PRO

Device Type = 10 (0Ah)

DigiTech Procedures recognized by the GSP21 and the GSP21 PRO

Request Configuration (00h)
Request One Program (01h)
Receive Microcode (40h)
Receive Configuration (41h)
Receive One Program (42h)

Continuous Controller Calculations

Parameter Value = (CC_Value * 2 * (PARAM_MAX + 1))/256

CC_VALUE The value of the continuous controller. (0-127)
PARAM_MAX The maximum value of the parameter the continuous controller is

changing.

Data format for the GSP21 Receive Configuration procedure

Please note that each internal ram byte (d7 - d0) is transmitted as 2 midi
bytes. The first midi byte is 0000000xb where x is d7. The second midi byte
is 0xxxxxxxb where x is d6 - d0. Refer to the Receive Configuration
procedure in the General Midi Implementation Manual for required header
information.

Ram Byte Number Quick Definition

1 - 2880 64 Program definitions
2881 - 3375 11 Algorithm definitions
3376 Program number
3377 Midi receive channel
3378 Midi transmit channel