Lexicon LXP-15 Owner's Manual

LXP-15

Multi-Effects

Processor

Owner's
Manual

Unpacking and Inspection

After unpacking the LXP-15, save all packing materials in case you ever need to ship the unit. Thoroughly inspect
the LXP-15 and packing materials for signs of damage. Report any shipment damage to the carrier at once; report
equipment malfunction to your dealer.

Notice

This equipment generates and uses radio frequency energy and if not installed and used properly, that is, in strict
accordance with the manufacturer's instructions, may cause interference to radio and television reception. It has
been type tested and found to comply with the limits for a Class A computing device in accordance with the
specifications in Subpart J of Part 15 of FCC Rules, which are designated to provide reasonable protection against
such interference in a residential installation. However, there is no guarantee that interference will not occur in a
particular installation. If this equipment does cause interference to radio or television reception, which can be
determined by turning the equipment OFF and ON, the user is encouraged to try to correct the interference by one
or more of the following measures:

Reorient the receiving antenna
Relocate the computer with respect to the receiver
Move the computer away from the receiver
Plug the computer into a different outlet so that the computer and receiver are on different
branch circuits.

If necessary, the user should consult the dealer or an experienced radio/television technician for additional
suggestions. The user may find the following booklet prepared by the Federal Communications Commission
helpful:

"How to identify and Resolve Radio/TV Interference Problems."

This booklet is available from the U.S. Government Printing Office, Washington, DC 20402, Stock No. 004-000­00345-4.

This triangle, which appears on
your component, alerts you to
the presence of uninsulated,
dangerous voltage inside the
enclosure... voltage that may be
sufficient to constitute a risk of
shock.

WARNING:

TO REDUCE THE RISK OF FIRE OR

ELECTRIC SHOCK, DO NOT EXPOSE

THE UNIT TO RAIN OR MOISTURE.

Copyright 1991
All Rights Reserved.

Lexicon Part #070-07831 Rev 1

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

This triangle, which appears on
your component, alerts you to
important operating and main­tenance instructions in this ac­companying literature.

WARNING:

DO NOT DEFEAT OR REMOVE

GROUND PIN ON THE POWER PLUG.

Lexicon Inc.
3 Oak Park
Bedford, MA 01730 USA
Telephone [phone]
Fax [phone]

Safety Suggestions

Read Instructions Read all safety and operating instruc-

tions before operating the unit.
Retain Instructions Keep the safety and operating instruc-

tions for future reference.
Heed Warnings Adhere to all warnings on the unit and in the

operating instructions.

Follow Instructions Follow operating and use instructions.
Heat Keep the unit away from heat sources such as radia-

tors, heat registers, stoves, etc., including amplifiers which
produce heat.

Ventilation Make sure that the location or position of the unit
does not interfere with its proper ventilation. For example, the
unit should not be situated on a bed, sofa, rug, or similar
surface that may block the ventilation openings; or, placed in
a cabinet which impedes the flow of air through the ventilation
openings.

Wall or Ceiling Mounting Do not mount the unit to a wall or
ceiling except as recommended by the manufacturer.

Power Sources Connect the unit only to a power supply of
the type described in the operating instructions, or as marked
on the unit.

Grounding or Polarization* Take precautions not to defeat
the grounding or polarization of the unit’s power cord.

*Not applicable in Canada.

by the manufacturer.
Servicing Do not attempt any service beyond that described

in the operating instructions. Refer all other service needs to
qualified service personnel.

Damage requiring service The unit should be serviced by
qualified service personnel when:

the power supply cord or the plug has been damaged,
objects have fallen, or liquid has been spilled into the

unit,
the unit has been exposed to rain,
the unit does not appear to operate normally or exhibits

a marked change in performance,
the unit has been dropped, or the enclosure damaged.

Outdoor Antenna Grounding If an outside antenna is
connected to the receiver, be sure the antenna system is
grounded so as to provide some protection against voltage
surges and built-up static charges. Section 810 of the Na­tional Electrical Code, ANSI/NFPA No. 70-1984, provides
information with respect to proper grounding of the mast and
supporting structure, grounding of the lead-in wire to an
antenna-discharge unit, size of grounding conductors, loca­tion of antenna-discharge unit, connection to grounding
electrodes, and requirements for the grounding electrode.
See figure below.

Power Lines An outside antenna should be located away

Power Cord Protection Route power supply cords so that

they are not likely to be walked on or pinched by items placed
on or against them, paying particular attention to cords at
plugs, convenience receptacles, and the point at which they
exit from the unit.

Nonuse Periods Unplug the power cord of the unit from the
outlet when the unit is to be left unused for a long period of
time.

Water and Moisture Do not use the unit near water — for
example, near a sink, in a wet basement, near a swimming
pool, near an open window, etc.

Object and liquid entry Do not allow objects to fall or liquids
to be spilled into the enclosure through openings.

Cleaning The unit should be cleaned only as recommended

Ground
Clamp

Electric
Service
Equipment

NEC — National Electrical Code

from power lines.

Antenna Lead-in
Wire

Antenna Discharge
Unit (NEC Section
810-20)

Grounding Conductors
(NEC Section 810-21)

Ground Clamps

Power Service Grounding
Electrode System
(NEC Art 250, Part H)

LXP-15

Multi-Effects

Processor

Owner's
Manual

Introduction

1. Installing the LXP-15

Unpacking • Mounting • Power ........................................................................ 1-1

Front Panel Controls ........................................................................................1-2

Rear Panel Connectors....................................................................................1-3

MIDI Connections ............................................................................................ 1-4

Audio Connections........................................................................................... 1-4

2. Front Panel Operation

Definition of terms ............................................................................................2-1

Setting Audio Levels ........................................................................................2-2

The LXP-15 Display .........................................................................................2-3

The Page Knob................................................................................................2-4

Presets and User Setups .................................................................................2-5

Selecting LXP-15 presets • Loading a preset • Modifying a preset
Naming your new setup • Storing a new sound • Recalling a register

System Parameters ......................................................................................... 2-8

3. The Algorithms

Signal Flow ...................................................................................................... 3-1

Delay/Reverb ................................................................................................... 3-3

Pitch/Delay....................................................................................................... 3-6

Gate ................................................................................................................. 3-9

Plate............................................................................................................... 3-11

Chorus Delay ................................................................................................. 3-13

4. Creating Sounds and Effects

Sounds and Effects.......................................................................................... 4-1

Patching ...........................................................................................................4-6

Global and General Purpose Patches ........................................................... 4-13

Setting up Global Patches ............................................................................. 4-14

Setting up General Purpose Patches ............................................................4-16

Patching Examples ........................................................................................ 4-21

5. The Presets

About the presets............................................................................................. 5-1

Presets 1-52.....................................................................................................5-2

Presets 53-96...................................................................................................5-3

Presets 97-128.................................................................................................5-4

6. MIDI Operation

Selecting a MIDI Channel ................................................................................ 6-1

Accessing Registers and Dynamic MIDI® ...................................................... 6-1

Controller quirks • MIDI Tempo control • Slaving to two or more
LXP-15s • Creating SysEx Patches using MIDI SysEx

The MIDI Page................................................................................................. 6-4

7. MIDI Implementation Data

Data/Event Requests .......................................................................................7-1

Transmit/Receive Data .................................................................................... 7-2

Data Dump Contents ....................................................................................... 7-4

Parameter Definitions ...................................................................................... 7-5

Microcode Parameters..................................................................................... 7-8

Implementation Chart.....................................................................................7-13

8. Troubleshooting

Low Voltage • Overheating • Common MIDI Problems....................................8-1

Restoring Factory Presets and Registers ........................................................ 8-2

9. Specifications
Tempo to Delay Time Conversion
User Program Log Sheet

Contents

Introduction

Congratulations on your purchase of the LXP-15 Multi-Effects Processor! You
are about to experience superb sound quality and a full range of reverb, pitch
shifting, and delay effects, coupled with fast, intuitive editing of preset sounds
and an industry-leading MIDI implementation.

The LXP-15 offers a rich and distinctive palette of special effects, including 128
preset effects programs to get you started. Each program has up to five display
pages of variable parameters that you can adjust for subtle or dramatic changes
in the program’s sound, and you can store as many as 128 customized programs
in user memory. All of the LXP-15 functions are accessible from the front panel,
or via MIDI, providing truly world-class flexibility and control. From pitch shifting
to stereo delays and flanging, the LXP-15 delivers superior performance.
Whether you are a producer, engineer, or musician—whether you work on stage
or in the studio— the LXP-15 will quickly become an indispensible part of your
sound.

We’re confident you’ll find that the LXP-15’s unique combination of state-of-the-
art sound and extraordinary versatility is exactly what you’re looking for. A Quick
Reference card provides the basics of operation in a compact format to get you
up and running as quickly as possible — but to make sure you don’t miss out on
anything, we’d like you to read this manual. It provides a thorough explanation
of both front panel and MIDI operation, program descriptions, and complete MIDI
Implementation data — all the information you need to access the full power of
the LXP-15.

Installing the LXP-15

Installing the
LXP-15

1

After unpacking the LXP-15, save all packing materials in case you ever need
to ship the unit. Thoroughly inspect the LXP-15 and packing materials for signs
of damage. Report any shipment damage to the carrier at once. The following
accessories are included with the LXP-15:

1. Power Cable

2. Feet (for use if not rack-mounted)

3. Owner's Manual

4. Quick Reference Guide

5. Warranty card (USA only)

Connect the cable end of the LXP-15 line cord to the LXP-15 power connector.
Then plug the line cord into an appropriate AC wall socket.

The LXP-15 measures 19"W x 1.75"H x 13.9"D (483 x 45 x 353 mm). Make sure
that the LXP-15 is securely screwed into the rack, and that support is provided
for the rear of the chassis during transport to avoid possible damage from severe
mechanical shock.

Unpacking

Power

Mounting

The maximum ambient operating temperature is 95°F (35°C). Provide adequate
ventilation if the LXP-15 is mounted in a closed rack with heat-producing
equipment such as synthesizer modules, effects units, or power amplifiers.
Avoid mounting the LXP-15 directly above power amplifiers.

1-1

LXP-15 Owner's Manual

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3
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LXP-15

Front Panel

Controls

Input

Sets the audio input level.

Output

Controls the signal level
sent to the LXP-15 out­puts.

View

Used to display alternate
screen information.

Lexicon

POWER

Power on/off.

INPUT OUTPUT

exicon

Headroom

Green LEDs indicate sig­nal present; red LED indi­cates the signal is -3dB
from peak overload, or at
processor overload .

HEADROOM

OVL

12
18
24

Soft buttons

Each of these five buttons
is used for assigning the
parameter displayed di­rectly above it to ADJUST
knob control.

ADJUST PAGE

VIEW

Reverb
Pitch/EQ
Dly
Setup
Store
Name
Global
MIDI

Adjust

Used to edit paramaters
displayed and selected
with the Soft buttons.

POWER

Level

Mod

Al
Patch 1
Patch 2
Patch
Patch

Sys

LXP-15

Page knob

Used for selection of 16
display pages

1-2

MIDI IN

Receives MIDI informa­tion from other MIDI
equipment such as mas­ter keyboard controllers,
MIDI foot controllers, se­quencers and synthesiz­ers.

MIDI THRU

Passes any MIDI data re­ceived without change.

MIDI OUT

Transmits MIDI data to
other equipment.

Installing the LXP-15

LXP-15
Rear Panel
Connectors

Outputs (L and R)

Single-ended (unbal­anced) stereo outputs pro­vide +4dBu nominal out­put level. Either can be
used for mono output.

AC Power

AC PWR

Dynamic MIDI

IN OUTTHRU

FOOT

1 234

CONTROLLERS

Foot Controllers

Five connectors for toggle
(Push on/push off) mo­mentary contact foot
switches, or continuous
footpedals (50 kΩ).

L OUTPUTS R L INPUTS R

5

AUDIO

Inputs (L and R)

Single-ended (unbal­anced) inputs accept lev­els as low as -26dBu. In­put impedance is 50 kΩ in
stereo, 25 kΩ in mono. Ei­ther can be used for mono
input.

1-3

LXP-15 Owner's Manual

Lexicon

MIDI Connections

Audio Connections

MIDI connections are dependent on your applications, and on the equipment
available in your system. For examples of MIDI system connections, see
Chapter 6:

MIDI Operation.

This section outlines several connection possibilities for the LXP-15. Because
each sound system is unique, we recommend experimentation to arrive at the
best configuration for your system. Always check connections for proper
impedance, polarity, and levels.

Audio connections to the LXP-15 are unbalanced, and should be made with high
quality shielded cables with 1/4" tip-sleeve phone jacks at the LXP-15 end. The
connectors must be wired as shown below:

Sleeve - Shield/Ground

Tip - High

Mono or stereo?

If only 1/4" tip-ring-sleeve phone jacks are available, they must be wired as
shown:

Sleeve - Shield/Ground

Tip - High

Ring - Connect to Sleeve

The LXP-15 produces wonderful stereo effects from either mono or stereo signal
sources. For mono sources, use either of the two input connectors; the dry signal
appears (along with the stereo effects) in mono at both output connectors. For
instruments and sources with stereo outputs, use both inputs. We recommend
using both LXP-15 outputs whenever possible but, if mono output is required,
you can use just one of the two output connectors. When only one output is used,
the left and right signals are summed internally .

Some of the examples on the following pages use stereo instruments and
amplification systems, others use mono. Feel free to adapt the examples to your
specific requirements.

1-4

g

3
4

Channel Input or
Effects Return (R)

Channel Input or
Effects Return (L)

Effects
Send

Installing the LXP-15

Connection to a
mixing console's
effects sends

Input

exicon

INPUT OUTPUT

HEADROOM

OVL

(L or R) R Output

12
18
24

L Output

VIEW

If you will be using an LXP-15 as your primary effects unit, and your system
includes a console with one or more auxiliary (effects) sends, connect the LXP­15 as shown above. In most applications, it is preferable to connect the LXP-15
outputs to two of the console's input channel strips, panned full left and right,
rather than the effects returns. This allows the greatest flexibility in routing and
equalization.

In this configuration the console controls are used to set the amount of effect
heard—the LXP-15 program's MIX control should be set to 100% wet.

ADJUST PAGE

Reverb
Pitch/EQ
Dly
Setup
Store
Name
Global
MIDI

Patch 1
Patch 2
Patch
Patch

POWER

Level

Mod

Al

Sys

LXP-15

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LXP-15 Owner's Manual

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Connection between

instrument and

console

Lexicon

Channel Input
(pan right)

Channel Input
(pan left)

exicon

INPUT OUTPUT

HEADROOM

OVL

12
18
24

Synth

L Output

LXP-15

L Output

VIEW

In

In

Synth
R Output

LXP-15
R Output

ADJUST PAGE

Reverb
Pitch/EQ
Dly
Setup
Store
Name
Global
MIDI

Level

Patch 1
Patch 2
Patch
Patch

POWER

Mod

Al

Sys

LXP-15

In some applications (such as when an LXP-15 is used for a single instrument)
it may be desirable to patch the LXP-15 between the instrument and console.
This makes it possible to keep the LXP-15 up on stage with other MIDI gear,
rather than in the console effects rack, making MIDI control much easier.

Set the LXP-15 MIX control to approximately 50%.

1-6

g

3
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Guitar
Output

Installing the LXP-15

Connection between
instrument and
amplifier

INPUT OUTPUT

exicon

HEADROOM

OVL

12
18
24

LXP-15 Input

(L or R)

Amp
L Input

LXP-15
L Output

LXP-15
R Output

Amp

R Input

For a very spacious guitar sound, connect the LXP-15 between a guitar and two
amp and speaker stacks. Set the LXP-15 MIX control to approximately 50%. The
only problem with this setup is that if you use overdrive distortion created by the
amplifier, changing settings on the LXP-15 also affects the quantity and quality
of your distortion. If you use a separate distortion box, you can get around this
problem by connecting it before the LXP-15. If you prefer amplifier-generated
distortion, try the setup shown on the next page.

ADJUST PAGE

VIEW

Reverb
Pitch/EQ
Dly
Setup
Store
Name
Global
MIDI

Patch 1
Patch 2
Patch
Patch

POWER

Level

Mod

Al

Sys

LXP-15

1-7

LXP-15 Owner's Manual

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Connection between

instrument preamp

and power amplifier(s)

Lexicon

WARNING! Never connect speaker outputs from a
guitar amp to the LXP-15. Doing so can cause
serious damage which is not covered by the LXP-15
warranty. On some guitar amplifiers it is very easy to
accidentally use a speaker output instead of a direct
or effects output. BE CAREFUL!

Guitar
Output

Amp or

Preamp

Input

Direct or
Preamp output

LXP-15 Input (L or R)

INPUT OUTPUT

exicon

HEADROOM

OVL

12
18
24

L and R Speaker Outputs from Power Amp

Amp

L Input

VIEW

LXP-15
L Output

ADJUST PAGE

Reverb
Pitch/EQ
Dly
Setup
Store
Name
Global
MIDI

LXP-15
R Output

Amp
R Input

Level

Patch 1
Patch 2
Patch
Patch

POWER

Mod

Al

Sys

LXP-15

If you use overdrive distortion, it's usually better to create the overdrive

before

sending the signal to the LXP-15 to ensure that the effects don't change the
quantity and quality of your distortion. In this setup, you need a guitar pream­plifier or a guitar amp with a direct output. Feed this signal to either of the LXP­15 inputs, and then on to a stereo power amp or a pair of guitar amps. (A few
guitar amplifiers become unhappy if they are operated without speakers
connected. Consult the amp manufacturer for details.)

You can use the effects send and return connectors on a mono guitar amp to
obtain similar results. Adjust the LXP-15 output level so that the amp produces
the same output with the LXP-15 as it does without it.

1-8

Console

g

3
4

g

3
4

Inputs

Console
Inputs

Installing the LXP-15

Connection between
drum machine and
console

LXP-15 Outputs

(L and R)

INPUT OUTPUT

exicon

LXP-15 L Input

HEADROOM

OVL

12
18
24

exicon

INPUT OUTPUT

HEADROOM

LXP-15 Outputs

(L and R)

ADJUST PAGE

Reverb
Pitch/EQ

OVL

12
18
24

VIEW

Dly
Setup
Store
Name
Global
MIDI

POWER

Level

Mod

Al

Patch 1

LXP-15

Patch 2
Patch
Patch

Sys

LXP-15 Inputs

(L and R)

Drum machine's
stereo outputs

Drum machine's individual
output for snare drum

Using two LXP-15 units between your drum machine and console can make your
drum machine sound much more exciting, since it allows you to process the all­important snare drum separately from the rest of the mix. Make sure you remove
the snare from the drum machine's main stereo mix.

VIEW

ADJUST PAGE

Reverb
Pitch/EQ
Dly
Setup
Store
Name
Global
MIDI

POWER

Level

Mod

Al

Patch 1

LXP-15

Patch 2
Patch
Patch

Sys

1-9

LXP-15 Owner's Manual

Lexicon

1-10

Terms used in this manual

Algorithm The LXP-15 contains several

of instructions that tells the LXP-15's microprocessor how to process the
input signal. One algorithm produces pitch/delay, another produces gated
reverb, etc.

Parameter Each algorithm has a set of
characterize it. The settings of the parameters can be changed to create
radically different sounds from a single algorithm.

algorithms

parameters

. An algorithm is a set

(controls) that uniquely

Front Panel Operation

2

Front Panel
Operation

Program Parameter

examples are: delay time, pitch shift, etc.

System Parameter

System parameters are not stored in registers or presets, nor do their
values change when a new setup is recalled. Examples are: display
contrast and brightness, MIDI Channel number, etc.

Patch A patch is a routing assignment that allows an LXP-15 parameter to
be driven by a source control such as a footpedal, or a synthesizer mod
wheel.

Setup A
a certain sound (and as many as four general purpose patches). Each
register or preset is a setup, as is the current state of the machine.

Pages

and/or values are displayed simultaneously.
Register/Preset The LXP-15 contains 256 setups. 128 of these are

presets

are
The factory presets cannot be overwritten, but they can be modified and
stored into registers (or copied into registers, then modified). When
shipped, the LXP-15 already has a duplicate of the presets loaded into its
registers.

setup

is a collection of specific parameter values responsible for

Pages

registers

are groups of parameters (or other quantities) whose names

which are useful setups permanently initialized at the factory; 128

which are available for storing your own setups and effects.

values are stored/recalled in setups. Some

values are not associated with a particular setup.

2-1

LXP-15 Owner's Manual

Lexicon

Setting Audio Levels

The wide range of adjustment available with the LXP-15 INPUT and OUTPUT
controls allow it to be used with virtually any kind of equipment found in the studio
or on the road.

To set audio levels:

1. Turn the LXP-15 INPUT and OUTPUT controls all the way down (fully
counterclockwise).

2. Set the instrument output, preamp output, or effects send that feeds the
LXP-15 input(s) to a nominal level. With an instrument, this should be your
loudest normal playing level; with a preamp output or console, adjust the
output(s) or effects send(s) to produce the highest level possible with the
least amount of noise. If the output you are using doesn't have a level
control, don't worry about it!

3. While sending audio to the LXP-15, gradually turn up the INPUT control until
the red OVL LED just flashes on the loudest peaks. If it flashes continuously,
turn the INPUT control down slightly. This ensures the best possible signal­to-noise ratio and dynamic range.

In general, it is best to set the gains in your system so that the nominal input
to the LXP-15 is at least 12dB from the maximum converter (peak) level.

OVL LED flashes on peaks; INPUT
level should be set to the level where

Green LEDs should be lit.

the OVL LED flashes briefly on the
loudest peaks only.

HEADROOM

OVL

12



18



24



Note: If the OVL LED flashes with no input present it indicates processor
overload is occurring.

4. Turn the LXP-15 OUTPUT control up.

2-2

Front Panel Operation

On most of the LXP-15 display pages, three lines of alphanumeric information
are available:

1. System status

2. Parameter names

3. Parameter settings

The front panel VIEW button allows you to choose between display of the first
and second, or the second and third lines.

Pressing VIEW

This line shows system status
Params appear on this line

VIEW

Params appear on this line
Param values are shown here

allows you to alternate these displays.

Each display line is divided into five 7-character fields. This allows as many as
five items to be displayed simultaneously.

The LXP-15 Display

VIEW

1234567 1234567 1234567 1234567 1234567
1234567 1234567 1234567 1234567 1234567

In general, pressing the button below any display field will select the item in that
field for modification by the ADJUST knob.

Pitch Intervl HiCut LoCut
On Fifth 0 320Hz 1.35kHz

In this example pressing this button has
selected "HiCut". The value of this parameter is
bracketed by arrows to highlight its selection.

PchFine

Pitch Intervl HiCut LoCut
On Fifth 0 1.15Hz 1.35kHz

ADJUST

Turning the ADJUST knob alters the value
of the selected item.

PchFine

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LXP-15 Owner's Manual

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Lexicon

The Page Knob

The PAGE knob has 16 labeled settings. These selections are grouped into
three basic functional areas. The upper section provides for selection of the
available parameters which define the sound of each algorithm (Reverb, Pitch
EQ, Delay, Level, Modulation, and Algorithm).

Reverb
Pitch/EQ
Dly
Setup
Store
Name
Global
MIDI

PAGE

Level

Mod

Al
Patch 1
Patch 2
Patch
Patch

Sys

The settings grouped on the lower left allow various routine functions to be
performed on setups (recalling, storing, naming, specifying MIDI Channel, etc.)
These pages do not have an alternate display.

System parameters, and patch assignments are selected at the settings
grouped on the lower right.

2-4

Front Panel Operation

g

3
4

Presets and User
Setups

Any one of 128 preset setups can be selected by the PAGE and ADJUST knobs
on the front panel. To select a preset, first turn PAGE to SETUP

.

Selecting LXP-15
presets

The following display will appear:

Preset # Name alg: XX
Preset Registr Pre scan Reg scan Load

If you press the button directly below "Preset" the ADJUST knob will scroll
through (and sequentially load) each one of the 128 presets. Pressing "Pre
scan" allows you to use the ADJUST knob to simply scroll through the list of

Reverb
Pitch/EQ
Dly
Setup
Store
Name
Global
MIDI

PAGE

Level

Mod

Al
Patch 1
Patch 2
Patch
Patch

Sys

preset names without loading them. If you use this method, you must press the
button beneath "Load" to actually select a preset. (Viewing, selecting and
loading registers follow exactly the same procedure.)

For quick reference, the names of the 128 presets are shown in the table below.
The presets are generally grouped as follows: 1-78 general purpose; 79-86
guitar or bass; 87-102 guitar or keyboards; 103-117 keyboards; 118-128 special
effects. For now, pick any one to try it out. (The first 50 or so should be generally

Use PAGE to select "SETUP".
Press "Preset", then use ADJUST to

select and load a specific preset.

or

Press "Pre scan", then use ADJUST to
scan the presets. Press "Load"
toselect any displayed preset.

useful and do not make extensive use of patched parameters).

1 Large Hall
2 Bright Hall
3 Dark Hall
4 Large Room
5 Large Drk Room
6 Medium Room
7 Medium & Short
8 Medium Room 3

9 Med & Bright
10 Small Room
11 Small Room 2
12 No Room
13 Small & Bright
14 Dark Closet
15 Large Dly Room
16 Med Dly Room
17 1/4 Verb MAT
18 Dark Dly Room
19 Small & Delay
20 Vocal Room
21 Vocal 36
22 Late Vocal
23 Vocal Plate
24 Plate
25 Small Plate
26 Long Plate
27 Plate 15
28 Brite Plate
29 Dark Plate
30 Small Gate
31 Medium Gate
32 Large Gate

33 Bright Gate

34 Slap Gate

35 Short Slap
36 Tap Detune
37 Ambi Detune
38 Ambi Delay
39 Long Delay
40 L&R Delays
41 1/4 Note MAT
42 1/8 ➞ 1/16 MAT
43 Space Echo
44 Delay Cloud
45 Ambi Tap 5th Up
46 Roomy 4th Dwn
47 Roomy Oct Up
48 Chorus
49 Chorus Too!
50 Chorus & Doubl
51 Slap & Chorus
52 Chorus & Delay
53 Detune Chorus
54 Small & Flange
55 Flange Room
56 Piano Flange
57 Mix Jizzn'
58 Image Wander
59 Wander Fast
60 Wander Room
61 Wander&Small
62 Small&Fast
63 Image Detune
64 Wide Image

65 Jumpin' Beans
66 Thru A Ringr
67 LFO Roll
68 Thick Chorus
69 Gtr:Eko-Room
70 Sizzle Verb
71 Dly Gate ➞ Rite
72 Thick'r Gate
73 Deep End
74 Jazz Swing Dly
75 Glub .… Glub
76 SoftLoopFoot
77 DlyLoopFoot
78 ChrsLoopFoot
79 AmbiChrEnv<
80 AmbiChrEnv>
81 ShortAmbiDly
82 LongAmbiDly
83 EnvDetune2
84 EnvDetune3
85 RoomChrEnv
86 Spacious5th^
87 Bounce ➞ Rvrb
88 Rvrb ➞ XDly
89 XDly ➞ Rvrb
90 Fade In Box
91 Fade In Chorus
92 Fade In Space
93 Fade In Room
94 Cascade8 1
95 Cascade8Env<
96 Glass 3

97 Drop Tail Env<
98 VaryRes1Foot

99 Pedal1Reverb
100 VaryCaveFoot
101 PtchLoopFoot
102 PedalWhammy1
103 XDly ➞ RvrbMod
104 VaryCaveMod
105 ConvrtRvbMod
106 ConvrtDlyMod
107 8Va CloudMod
108 VaryRes2Mod
109 Mod Whammy1
110 XDelay Aft
111 ConvrtRvbAft
112 SpacOctUpAft
113 8Va CloudAft
114 AftFlngVerb
115 Big Flush
116 DlyLoopMIDI
117 SpacLoopMIDI
118 XDelayEnv<
119 Bounce Wave
120 DlyCloudEnv>
121 RvrbWarpEnv>
122 Gated Dive
123 MoanVerb
124 Oddness
125 Rising Cloud
126 Cascad8Env>
127 Le Boom
128 Bypass

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LXP-15 Owner's Manual

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Loading a preset

Modifying a preset

If you have chosen a preset with "Pre scan" selected, press the button directly
below "Load" to load it. If you made your selection with "Preset" selected, you're
all set, since this mode automatically loads the preset you've selected. (For
footswitch control of preset changes, see Chapter 4:

Effects

)

Creating Sounds and

Once you've selected a preset, turn the PAGE knob to select one of the six
parameter pages (Delay, Pitch/EQ, Reverb, Level, Mod or Alg). One page of
parameters will appear on the display.

Preset 2 Bright Hall alg: Dly/Rvb

Decay Treble Bass Mpy Size Diffus

The PAGE knob will step through the other available parameter pages. You can
change the value of any parameter by selecting it (push the button directly
beneath it) and then turning the ADJUST knob to a new value.

When you turn the ADJUST knob, the bottom line of the display will change to
show the full name of the selected parameter and the selected value. These
values will change as you continue to turn ADJUST.

Preset 2 Bright Hall alg: Dly/Rvb

Decay Time 3.6s

Full name of selected
parameter.

Parameter value - this will
change as you turn ADJUST.

The screen will return to its normal 5-parameter display if you select another
parameter, or if 2 seconds pass without further parameter adjustment.

When the display returns to its normal state the setup name will be marked with
an asterisk to indicate that the setup has been modified. This asterisk will remain
until the setup is stored, or until another setup is loaded (clearing this setup and
any changes made to it).

The setup name is now
marked to show that it has
been modified

Preset 2 *Bright Hall alg: Dly/Rvb

Decay Treble Bass Mpy Size Diffus

Remember that pressing VIEW will display the parameters along with their
settings.

Decay Treble Bass Mpy Size Diffus

3.6s 8.98kHz 0.71x 64Meter 75%

2-6

Front Panel Operation

If you want to keep this modified preset as a new setup, it is a good idea to assign
it a new name before storing it. To change the name of a setup, turn PAGE to
"Name". The following display will appear.

Preset # Name Edit: Bright Hall

<Char Char> - - -

Note that the first letter of the current setup name is underlined by a cursor,
indicating that it is selected. Turning the ADJUST knob allows you to replace this
character with the first letter of the name you want. The ADJUST knob dials
sequentially through a list of alphanumeric characters in the following order:
(space), 0-9, A-Z, a-z, and an assortment of standard symbols. Pressing the
buttons under "<Char" and "Char>" will step the cursor to the left and right,
allowing you to choose the characters you want to change.

After creating a new sound, and assigning it a name, you may want to save it for
future use in one of the LXP-15's 128 registers. — New entries will overwrite any
program stored at that location, so be careful not to store into a location that
contains a setup you want to save. (We have provided a chart for you to record
your own program entries at the end of this manual.)

Naming your new setup

Storing a new sound

To store a setup, turn PAGE to "Store". The following display will appear.

Store into Registr XX Briter Hall ?

Reg # - - - Store

If the register shown on the top line of the display contains a setup you want to
keep, select "Reg #" and turn ADJUST to a register you don't mind overwriting.
When the display shows the register you want, simply press the button beneath
"Store". Successful storage is indicated by the following display:

Stored Registr XX Briter Hall

Reg # - - - Store

Note: The LXP-15 will not perform a store instruction if memory write-protect

is enabled (see next page), or if you accidentally try to store into a Preset
location.

To recall a register, simply turn PAGE to "Setup", select "Registr" and dial the
ADUST knob to the register you want. The setup is automatically recalled and
ADJUST may be used to modify the sound. (For footswitch control of setup
changes, see Chapter 4:

Creating Sounds and Effects.

)

Recalling a register

2-7

LXP-15 Owner's Manual

Lexicon

System Parameters

MIDIchn

Contrst

Bright

To access LXP-15 System Parameters,simply turn the PAGE knob to "Sys". The
following display will appear:

MIDIchn Contrst Bright MemProt Update

(1-16,OMNI) (1-16) (0-15) (On/Off) (On/Off)

Pressing the button directly beneath any of these displayed items will select that
item for alteration with the ADJUST knob.

This control sets the MIDI channel. When selected, the ADJUST knob allows
you to choose MIDI Channels 1-16 (for both transmitting and receiving MIDI
data), or to choose OMNI (messages received on all channels and transmitted
on Channel 1).

Adjusting the contrast of the display allows you to optimize it for different viewing
angles.

The LXP-15 has 15 brightness levels to allow adjustment for different lighting
conditions.

Memory Write-Protect

Update

Memory Write-Protect is a feature that lets you prohibit the overwriting of the
setups stored in the registers. If the write-protect function is enabled, any attempt
to store to a register will cause the following display to appear:

Registr XX Name not stored !

Reg # - - - Store

Selecting "Mem Prot" in System Parameter mode allows you to choose ON or
OFF with the ADJUST knob.

This feature allows you to choose continual display update of patched parameter
values (ON), or display of only the base values of patched parameters (OFF).
See Chapter 4:

Creating Sounds and Effects

for details on patched parameters.

Note: Selection of Display Update ON will slow down the operation of the LXP­15 considerably. It is primarily useful when

setting up

patches, after which it is

recommended that it be turned OFF.

2-8

The LXP-15 contains five effects algorithms: Delay/Reverb, Pitch/Delay, Gate,

b

Plate, and Chorus Delay. When a preset or register is loaded, its algorithm is
shown in the top line of the display. (See Chapter 5:

The Presets

for a list of the

algorithms used in each preset.)
The algorithm parameters are grouped by function onto five pages: Delay, Pitch

EQ, Reverb, Levels and Mod. This format allows you to find the delay parame­ters, for example, at the same page and display location in each algorithm.
Parameters which are not available in an algorithm are assigned a blank space
to maintain this format.

NOTE: You can change the current algorithm by turning the PAGE knob to
"Alg" and using ADJUST to select a different algorithm. Be aware that different
algorithms have different parameters. Changing algorithms with ADJUST
may cause some parameters to be set to undesireable values. For this
reason, when you want to work with a different algorithm, select and load a
preset or register with the desired algorithm. This ensures that all parameters
are set to normal values.

The Algorithms

3

The Algorithms

The general signal flow through the LXP-15, as well as the features and
parameters of each of the five effects algorithms are described on the folllowing
pages.

The general signal flow through the LXP-15 is illustrated below.

Input

L

Input

R

Front Panel

Input Knob

Effects

Algorithm

Input

Level

Dry Pan

Wet Pan

Dry Pan

Signal Flow

Mix

+

Output Level

Output Level

+

Mix

Output

L

Front Panel

Output Kno

3-1

LXP-15 Owner's Manual

Lexicon

The routing and mixing of input and output signals for all algorithms are
controlled by the five parameters found on the “Level” page. As these parame­ters are common to all LXP-15 algorithms, they are described first. The
algorithm-specific parameters will be described with each algorithm.

LEVEL

InLevl Mix Wet Pan Dry Pan OutLevl

0-100% 0-100% 100%L-51%L, 100%R-51%R, 0-100%

Center, Center,

51%R-100%R 51%R-100%R

Input Level: Adjusts the amount of input signal sent into the effects algorithm.
This signal is the sum of the left and right inputs, after the front-panel input
control.

Mix: Adjusts the mixture of the dry (left and right inputs) and wet (the left and right
algorithm outputs) signals sent to the left and right outputs. When set to 0%, only
dry signal is present at the outputs. When set to 100%, only wet signal is present
at the outputs.

Dry Pan: A pan control for the dry signal. When a mono input source is used, Dry
Pan will “move” the sound between the left and right speakers. When a stereo,
or two-channel input source is used, Dry Pan will make one channel louder as
the other gets softer.

Wet Pan: A pan control for the wet signal. All effects in the LXP-15 are mono­in/stereo-out. Wet Pan will make one effects channel louder as the other gets
softer.

Output Level: Adjusts the amount of dry/wet mix sent to the front panel output
control.

3-2

The Algorithms

t

To get some idea of the types of sounds and effects that can be created with
the Delay/Reverb algorithm, be sure to listen to and experiment with presets
built on this algorithm. (See Chapter 5:

The Presets.

)

The Delay/Reverb algorithm consists of an equalizer in series with a unique glide
delay line and reverb simulator. The glide delay can be smoothly modulated
through its entire range with no glitches. While it is being modulated, the glide
delay produces pitch shift effects. Increasing delay times will shift the pitch of
signals being processed flat; decreasing delay times will shift the pitch sharp.
The amount of pitch shift will decrease as the glide delay stabilizes at the new
delay time. (There is no pitch shift when the delay has stabilized.) The
reverberator is a full-featured room simulator with its own predelay. Its many
parameters alllow you to design almost any space you can imagine. One unique
feature of this reverberator is infinite reverb: a wash of reverberated sound that
sustains forever. (See

Input

L

Decay

Glide Feedback

)

+

Reverb

Mix

+

Input

R

Input

Level

EQ

+

Glide Delay

(Modulation)

Delay 2

(Predelay)

Diffusor

Reverb

Delay/Reverb

Dry Pan

Wet Pan

Mix

+

Output Level

Outpu

+

Dry Pan

Mix

Output

L

DELAY

Glidely Gldfbk Delay 2 - -

0-638ms 0-100% 0-179ms

(64µs steps) (20µs steps)

PITCH EQ

- - - HiCut LoCut

320Hz-11.6kHz, Full,

Full 19Hz-1.35kHz

REVERB

Decay Treble BassMpy Size Diffus

.6-6.1s, 320Hz-11.6kHz, .35x-2.50x 8M-71M 0-100%

Infinite Full

LEVEL

InLevl Mix Wet Pan Dry Pan OutLevl

0-100% 0-100% 100%L-51%L, 100%R-51%R, 0-100%

Center, Center,

51%R-100%R 51%R-100%R

MODULATION

LFO Rat Rvb Mix - - -

.03Hz-4.84Hz 0-100%

Parameter pages in
the Delay/Reverb algorithm

3-3

LXP-15 Owner's Manual

Lexicon

Delay/Reverb parameters

Glide Delay:The master predelay for this algorithm, providing up to 683ms of

delay. Glide Delay produces pitch shift effects while it is being modulated.
Controlling Glide Delay with the LFO can produce vibrato, chorus and flanging
effects.

When creating patches, Glide Delay is controlled from two patch page parame­ters. Gldlyhi provides coarse control over the entire delay range for the
parameter (0-683ms). Gldly provides fine control over a smaller range (0-

16.1ms).
Glide Feedback: A positive feedback loop around Glide Delay. When set to

maximum (100%), it continues to add input signal into the feedback loop. Use
feedback for repeating echo effects and to deepen chorus/flanging effects
created by modulating Glide Delay.

Delay 2: Reverb predelay following the glide delay. It can provide as much
as179ms of additional delay.For setups that use a mix of both the glide delay and
reverberator outputs, use Delay 2 to acoustically separate the two effects.
Like Glide Delay, Delay 2 is controlled from two patch page parameters. Dly2hi
provides coarse control over the entire delay range for the parameter (0-179ms).
Dly2 provides fine control over a smaller range (5.04ms ).

HiCut: Adjusts high frequency roll-off for the algorithm. Roll-off is adjustable in
16 steps from flat to 320Hz.

LoCut: Adjusts low frequency roll-off for the algorithm. Roll-off is adjustable in
32 steps from flat to 19Hz.

Decay: Adjusts the reverb time for mid-frequency signals. Becase low frequency
reverb time (Bass Multipy) is a multplier of decay time, this parameter acts as a
master control for reverb time.

In this algorithm, Decay can be set to produce infinite reverb effects. When set
to “Infinit,” sounds in the reverb continue to reverberate, but do not decay. (For
a truly infinte reverb effect, all of the reverb page settings must be set
appropriately. See

Patching Examples

for an example of this effect.) While
decay is set to “Inifnit” input is locked out of the reverberator. This allows you to
play over the reverb wash, and prevents cumulative overloading. Experiment
with controlling Decay with MIDI Velocity or the input envelope follower for
performance control of this effect.

Treble : Sets the frequency above which sounds decay at a progressively faster
rate. When set relatively low, it gives a darker tone to the reverberation,
simulating the effect of air absorption in a real hall. Maximum setting gives a flat
response through the filter section.

Bass Multiply: Sets the reverb time for low-frequency signals, as a multiplier of
the Decay parameter. For example, if Bass Multiply is set to 2X and Decay is set
for 2 seconds, the low-frequency reverb time will be 4 seconds. For a natural­sounding hall ambience, values of 1.5X or less are recommended.

3-4