AKAI PRO APC 40 II USB APC40Mk2_Communications_Protocol_v1.2.pdf_7db83a06354c396174676105098e3a7d.pdf
Page 1
Akai APC40 Mk2 Communications Protocol
Version 1.2
Table of Contents
Introduction ....................................................................................................................... 3!
Scope ............................................................................................................................... 3!
Glossary ........................................................................................................................... 3!
General ............................................................................................................................. 3!
USB Ports ......................................................................................................................... 3!
Akai APC40 Mk2 Port .............................................................................................. 3!
General Format of MIDI System Exclusive message ....................................................... 3!
“Universal” MIDI messages .............................................................................................. 4!
Device Inquiry .......................................................................................................... 4!
Format of Device Inquiry Request message from Host to Device ....................... 4!
Format of response from APC40 Mk2 to Device Inquiry message ...................... 5!
The Note-On Message ............................................................................................. 7!
Format of Note-On message ............................................................................... 7!
The Note-Off Message ............................................................................................. 7!
Format of Note-Off message ............................................................................... 7!
The Controller Change Message ............................................................................. 7!
Format of Controller Change message ................................................................ 7!
“Akai Specific MIDI messages” ......................................................................................... 8!
Device Setup Message ............................................ Error! Bookmark not defined.!
Format of Device setup message from Host to DeviceError! Bookmark not defined.!
There is no inbound response to this message. .. Error! Bookmark not defined.!
Introduction Message ............................................................................................... 8!
Format of Introduction message from Host to Device .......................................... 8!
Format of response from APC40 Mk2 Introduction message .............................. 9!
Page 2
APC40 Mk 2 LED Map ........................................................................................... 10!
Outbound APC40 Mk2 Sysex Message Types .......................................................... 10!
Outbound Message Type 0: Introduction ............................................................... 10!
Format of Type 0 outbound message ................................................................ 12!
Outbound Message Type 1: LEDs. ........................................................................ 13!
Format of Type 1 outbound Midi note-on messages ......................................... 13!
Format of Type 1 outbound Midi note-off messages ......................................... 13!
Assignment of Note number messages to LEDs. Note 0x30 to 0x39 use MIDI
Channel 0 to 7 to indicate Tracks 1-8. All other note values ignore the MIDI
Channel. ............................................................................................................. 13!
Outbound Message Type 2: Controller Value Update messages .......................... 22!
MIDI Controller message ................................................................................... 23!
Assignment of controller numbers to absolute controllers ................................. 23!
Interpretation of LED Ring Types ........................................................................... 26!
Communications from device to PC Host - “Inbound” messages ................................... 29!
Inbound Standard MIDI Message types ..................................................................... 29!
Type NOTE1: Note-on/Note-off messages ............................................................ 29!
Midi note-on messages ...................................................................................... 30!
Midi note-off messages ...................................................................................... 30!
Type CC1: Absolute Controller messages ............................................................. 34!
MIDI Controller message ................................................................................... 34!
Assignment of controller numbers to absolute controllers ................................. 34!
Type CC2: Relative Controller messages .............................................................. 36!
MIDI Controller message ................................................................................... 37!
Interpretation of MIDI Controller values for Relative Controllers ........................ 37!
Assignment of controller numbers to relative controllers ................................... 37!
Document History ........................................................................................................... 38!
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Akai APC40 Mk2 Communication Protocol
Version 1.2 – January 19, 2015
Page 3
Introduction
APC40 Mk2 is a USB bus-powered, compact controller for Ableton Live and other software
applications. It features a 5x8 grid of RGB launch clips, 9 faders, and 16 knobs with LED
rings for software control. It features an array of UI buttons that will be used in conjunction
with Ableton Live and other software.
Scope
This document describes the format of messages between the APC40 Mk2 and the
PC/Mac Host.
Glossary
Outbound: The term “outbound” is used to describe messages sent from the PC Host
to the device, i.e. from the viewpoint of the PC Host.
Inbound: The term “inbound” is used to describe messages sent from the device to the
PC Host, i.e. from the viewpoint of the PC Host.
General
USB Ports
Akai APC40 Mk2 Port
This port handles all the Ableton specific messaging. All controls will communicate over
this port.
General Format of MIDI System Exclusive message
The System Exclusive messages exchanged between the PC Host and the device will be
of the following format:
Byte Number
Value
Description
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Version 1.2 – January 19, 2015
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Byte Number
Value
Description
1
0xF0
MIDI System exclusive message start
2
0x47
Manufacturers ID Byte
3
0x7F
System Exclusive Device ID
4
0x29
Product model ID
5
<Message ID>
Message type identifier
6
<DataLengthMS>
Number of data bytes to follow (most significant)
7
<DataLengthLS>
Number of data bytes to follow (least significant)
8
n data bytes
Data field – n bytes long
n+8
0xF7
MIDI System exclusive message terminator
The Manufacturer's identity field will contain the one-byte code allocated to Akai
Professional, which is 0x47.
The System Exclusive Device ID is typically used to select between multiple devices
connected to the same PC Host. In our application, we only expect one APC40 Mk2 to be
connected at any one time and so a value of 0x7F (broadcast) should be used (and it is
unlikely that the APC40 Mk2 will pay any regard to this field). If the situation changes and
we find that it is appropriate to have more than one APC40 Mk2 connected to a PC Host,
this field can be used to determine which device is the intended recipient of the message
and we can then determine how this parameter is assigned on each connected device.
The Message type identifier identifies the type of the message. This field will determine the
size of the data field and how the data field bytes should be interpreted.
There will be a number of data bytes in the message. Different message types are likely to
have a different data field lengths/formats.
“Universal” MIDI messages
Device Inquiry
APC40 Mk2 supports the convention of Device Inquiry
Format of Device Inquiry Request message from Host to Device
Byte Number
Value
Description
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Akai APC40 Mk2 Communication Protocol
Version 1.2 – January 19, 2015
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Byte Number
Value
Description
1
0xF0
MIDI System exclusive message start
2
0x7E
Non-Realtime Message
3
<MIDI Channel>
Channel to inquire. 0x00 – 0x0F. If set to 0x0x7F
inquiry is omni.
4
0x06
Inquiry Message
5
0x01
Inquiry Request
6
0xF7
MIDI System exclusive message terminator
The APC40 Mk2 will respond to a Device Inquiry Request message with the following
message:
Format of response from APC40 Mk2 to Device Inquiry message
Byte Number
Value
Description
1
0xF0
MIDI System exclusive message start
2
0x7E
Non-Realtime Message
3
<MIDI Channel>
Common MIDI channel setting
4
0x06
Inquiry Message
5
0x02
Inquiry Response
6
0x47
Manufacturers ID Byte
7
0x29
Product model ID
8
0x00
Number of data bytes to follow (most significant)
9
0x19
Number of data bytes to follow (least significant)
10
<Version1>
Software version major most significant
11
<Version2>
Software version major least significant
12
<Version3>
Software version minor most significant
13
<Version4>
Software version minor least significant
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Akai APC40 Mk2 Communication Protocol
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Byte Number
Value
Description
14
<DeviceID>
System Exclusive Device ID
15
<Serial1>
<Reserved, Set to 0x00 in this application>
16
<Serial2>
<Reserved, Set to 0x00 in this application>
17
<Serial3>
<Reserved, Set to 0x00 in this application>
18
<Serial4>
<Reserved, Set to 0x00 in this application>
19
<Manufacturing1>
Manufacturing Data byte 1
20
<Manufacturing2>
Manufacturing Data byte 2
21
<Manufacturing3
Manufacturing Data byte 3
22
<Manufacturing4>
Manufacturing Data byte 4
23
<Manufacturing5>
Manufacturing Data byte 5
24
<Manufacturing6>
Manufacturing Data byte 6
25
<Manufacturing7>
Manufacturing Data byte 7
26
<Manufacturing8>
Manufacturing Data byte 8
27
<Manufacturing9>
Manufacturing Data byte 9
28
<Manufacturing10>
Manufacturing Data byte 10
29
<Manufacturing11>
Manufacturing Data byte 11
30
<Manufacturing12>
Manufacturing Data byte 12
31
<Manufacturing13>
Manufacturing Data byte 13
32
<Manufacturing14>
Manufacturing Data byte 14
33
<Manufacturing15>
Manufacturing Data byte 15
34
<Manufacturing16>
This byte should be set to 0x00.
35
0xF7
MIDI System exclusive message terminator
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The Note-On Message
Format of Note-On message
Byte Number
Value
Description
1
0x9<Chan>
MIDI Note on, where Chan is a value from 0 – F and
specifies the MIDI channel.
2
<Note Number>
Note Number
3
<Velocity>
Velocity of the key-press. For controls that are not
velocity sensitive, this value should be 0x7F
The Note-Off Message
Format of Note-Off message
Byte Number
Value
Description
1
0x8<Chan>
MIDI Note on, where Chan is a value from 0 – F and
specifies the MIDI channel.
2
<Note Number>
Note Number
3
<Velocity>
Velocity of the key-release. For controls that are not
velocity sensitive, this value should be 0x7F
The Controller Change Message
APC40 Mk2 sends MIDI Controller Change messages from its buttons and knobs. It can
also receive Controller Change messages to turn LEDs On/Off
Format of Controller Change message
Byte Number
Value
Description
1
0xB<Chan>
MIDI Controller Change, where Chan is a value from
0 – F and specifies the MIDI channel.
2
<Controller>
Note Number
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Akai APC40 Mk2 Communication Protocol
Version 1.2 – January 19, 2015
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Byte Number
Value
Description
3
<Value>
Velocity of the key-release. For controls that are not
velocity sensitive, this value should be 0x7F
“Akai Specific MIDI messages”
Introduction Message
This message is sent before any other device-specific message (i.e. other than Device
Enquiry). It instructs the APC40 Mk2 to perform the necessary initialization and informs the
firmware of the version number of the application in order that changes in the application
can be catered for in the APC40 Mk2 firmware.
Format of Introduction message from Host to Device
Byte Number
Value
Description
1
0xF0
MIDI System exclusive message start
2
0x47
Manufacturers ID Byte
3
0x7F
System Exclusive Device ID
4
0x29
Product model ID
5
0x60
Message type identifier
6
0x00
Number of data bytes to follow (most significant)
7
0x04
Number of data bytes to follow (least significant)
8
0x00
Application/Configuration identifier
9
<Version High>
PC application Software version major
10
<Version Low>
PC application Software version minor
11
<Bugfix Level>
PC Application Software bug-fix level
12
0xF7
MIDI System exclusive message terminator
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Akai APC40 Mk2 Communication Protocol
Version 1.2 – January 19, 2015
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Format of response from APC40 Mk2 Introduction message
Byte number
Value
Description
1
0xF0
MIDI System exclusive message start
2
0x47
Manufacturers ID Byte
3
0x7F
System Exclusive Device ID
4
0x29
Product model ID
5
0x61
Message type identifier
6
0x00
Number of data bytes to follow (most significant)
7
0x04
Number of data bytes to follow (least significant)
8
<Slider #1 Value>
Sends the current value of Knob #1.
9
<Slider #2 Value>
Sends the current value of Knob #2.
10
<Slider #3 Value>
Sends the current value of Knob #3.
11
<Slider #4 Value>
Sends the current value of Knob #4.
12
<Slider #5 Value>
Sends the current value of Knob #5.
13
<Slider #6 Value>
Sends the current value of Knob #6.
14
<Slider #7 Value>
Sends the current value of Knob #7.
15
<Slider #8 Value>
Sends the current value of Knob #8.
16
<Slider #9 Value>
Sends the current value of Knob #9.
17
0xF7
MIDI System exclusive message terminator
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Akai APC40 Mk2 Communication Protocol
Version 1.2 – January 19, 2015
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APC40 Mk 2 LED Map
Outbound APC40 Mk2 Sysex Message Types
There will be three types of message from the PC host to the device.
Outbound Message Type 0: Introduction
This message is sent before any other device-specific message (i.e. other than Device
Enquiry). It instructs the APC40 Mk2 to perform the necessary initialization and informs the
firmware of the version number of the application in order that changes in the application
can be catered for in the APC40 Mk2 firmware.
There are three modes that are accepted. The unit defaults to Mode 0 on startup.
Mode
Identifier
Name
0
0x40
Generic Mode
1
0x41
Ableton Live Mode
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Akai APC40 Mk2 Communication Protocol
Version 1.2 – January 19, 2015
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2
0x42
Alternate Ableton Live Mode
Notes Regarding Generic Mode (Mode 0):
-[CLIP LAUNCH] buttons are momentary and should light its LED when ON.
-[CLIP STOP] buttons are momentary and should light its LED when ON.
-[ACTIVATOR], [SOLO], [RECORD ARM] are toggle buttons and should light its LED
when ON.
-[TRACK SELECTION] buttons (1-8 + MASTER) are radio style and only one of the 9
buttons is ON at a time. When ON its LED should light. These buttons will NOT send
out MIDI in generic mode for its state. These buttons dictate which one of nine banks
the DEVICE CONTROL knobs and DEVICE CONTROL switches belong to. These
knobs and switches will output on a different MIDI channel based on the current
Track Selection (track 1 = MIDI channel 0, track 8 = MIDI channel 7, MASTER = MIDI
channel 8). Upon pressing one of the Track Selection buttons, the current position of
the 8 Device Control knobs will be sent.
-[TRACK ACTIVATOR] buttons (1-8) are toggle buttons and will light its LED when ON.
-[CROSSFADER A/B], is a momentary button and will light its LED when ON.
-[TRACK SOLO], and [RECORD ARM] buttons are toggle buttons and will light its LED
when ON.
-[DEVICE LEFT (1)], [DEVICE RIGHT (2)], [BANK LEFT (3)], [BANK RIGHT (4)] will be
toggle style and will light its LED when ON.
-[DEVICE ON/OFF (5)], [DEVICE LOCK (6)], [CLIP/DEVICE VIEW (7)], [DETAIL VIEW
(8)] will be momentary style and will light its LED when ON.
-[BANK LOCK] button is momentary and will light its LED when ON.
-[SCENE LAUNCH] and [STOP ALL CLIPS] buttons are momentary buttons and will
light its LED when ON.
-TRACK CONTROL buttons are toggle buttons and will light its LED when ON.
-TRACK CONTROL KNOBS and buttons are NOT banked in any way.
-[UP], [DOWN], [LEFT], [RIGHT], [SHIFT], [NUDGE+], [NUDGE-], [METRONOME], and
[TAP TEMPO] are momentary buttons.
-[PLAY], [RECORD], and [SESSION RECORD] are momentary buttons and will light its
LED when ON.
[PAN], [SENDS], [USER], are toggle buttons and will light its LED when ON.
-LED rings are all set to SINGLE style.
Notes Regarding Ableton Live Mode (Mode 1):
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- All buttons are momentary buttons.
- Device control knobs and buttons are not banked within the APC40 Mk2.
- LED Rings around the knobs are controlled by the APC40 but can be updated by the
Host.
- All other LEDs are controlled by the Host.
Notes Regarding Alternate Ableton Live Mode (Mode 2):
- All buttons are momentary buttons.
- Device control knobs and buttons are not banked within the APC40 Mk2.
- All LEDs are controlled by the Host.
Format of Type 0 outbound message
Byte
Number
Value
Description
1
0xF0
MIDI System exclusive message start
2
0x47
Manufacturers ID Byte
3
<DeviceID>
System Exclusive Device ID
4
0x29
Product model ID
5
0x60
Message type identifier
6
0x00
Number of data bytes to follow (most significant)
7
0x04
Number of data bytes to follow (least significant)
8
0x40 or 0x41 or
0x42
Application/Configuration identifier
9
<Version High>
PC application Software version major
10
<Version Low>
PC application Software version minor
11
<Bugfix Level>
PC Application Software bug-fix level
12
0xF7
MIDI System exclusive message terminator
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Akai APC40 Mk2 Communication Protocol
Version 1.2 – January 19, 2015
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Outbound Message Type 1: LEDs.
This message is used to control the states of the LEDs. A note-on message will cause the
specified LED to switch on. A note-off message will cause the specified LED to switch off.
The field normally associated with note number will be used to specify the LED. The field
normally associated with velocity will indicate the LED display type. The field normally
associated with MIDI Channel will indicate the Track for certain LEDs. A Note On message
with a velocity of zero is equivalent to a Note Off message, however it is preferred that an
actual Note Off message is used.
Format of Type 1 outbound Midi note-on messages
Byte
Number
Value
Description
1
0x9<chan>
MIDI Note-on. The 4-bit <chan> value will be used for the track
strips
2
<ControlID
>
Identifier for LED object (“note number”)
3
State
Control value (This value will describe the state or color of the
LED: OFF/ON/blinking, etc.)
Format of Type 1 outbound Midi note-off messages
Byte
Number
Value
Description
1
0x8<chan>
MIDI Note-off. The 4-bit <chan> value will be used for the track
strips
2
<ControlID
>
Identifier for LED object (“note number”)
3
(Unused)
Control value (ignored)
Assignment of Note number messages to LEDs. Note 0x30 to 0x39 use MIDI Channel 0
to 7 to indicate Tracks 1-8. All other note values ignore the MIDI Channel.
Note
Number
MIDI Channel
Corresponding
LED
Velocity
0x00
0-15 = RGB Type
Clip Launch 1
See “RGB LEDS” Table below
0x01
0-15 = RGB Type
Clip Launch 2
See “RGB LEDS” Table below
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Version 1.2 – January 19, 2015
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Note
Number
MIDI Channel
Corresponding
LED
Velocity
0x02
0-15 = RGB Type
Clip Launch 3
See “RGB LEDS” Table below
0x03
0-15 = RGB Type
Clip Launch 4
See “RGB LEDS” Table below
0x04
0-15 = RGB Type
Clip Launch 5
See “RGB LEDS” Table below
0x05
0-15 = RGB Type
Clip Launch 6
See “RGB LEDS” Table below
0x06
0-15 = RGB Type
Clip Launch 7
See “RGB LEDS” Table below
0x07
0-15 = RGB Type
Clip Launch 8
See “RGB LEDS” Table below
0x08
0-15 = RGB Type
Clip Launch 9
See “RGB LEDS” Table below
0x09
0-15 = RGB Type
Clip Launch 10
See “RGB LEDS” Table below
0x0A
0-15 = RGB Type
Clip Launch 11
See “RGB LEDS” Table below
0x0B
0-15 = RGB Type
Clip Launch 12
See “RGB LEDS” Table below
0x0C
0-15 = RGB Type
Clip Launch 13
See “RGB LEDS” Table below
0x0D
0-15 = RGB Type
Clip Launch 14
See “RGB LEDS” Table below
0x0E
0-15 = RGB Type
Clip Launch 15
See “RGB LEDS” Table below
0x0F
0-15 = RGB Type
Clip Launch 16
See “RGB LEDS” Table below
0x10
0-15 = RGB Type
Clip Launch 17
See “RGB LEDS” Table below
0x11
0-15 = RGB Type
Clip Launch 18
See “RGB LEDS” Table below
0x12
0-15 = RGB Type
Clip Launch 19
See “RGB LEDS” Table below
0x13
0-15 = RGB Type
Clip Launch 20
See “RGB LEDS” Table below
0x14
0-15 = RGB Type
Clip Launch 21
See “RGB LEDS” Table below
0x15
0-15 = RGB Type
Clip Launch 22
See “RGB LEDS” Table below
0x16
0-15 = RGB Type
Clip Launch 23
See “RGB LEDS” Table below
0x17
0-15 = RGB Type
Clip Launch 24
See “RGB LEDS” Table below
0x18
0-15 = RGB Type
Clip Launch 25
See “RGB LEDS” Table below
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Version 1.2 – January 19, 2015
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Note
Number
MIDI Channel
Corresponding
LED
Velocity
0x19
0-15 = RGB Type
Clip Launch 26
See “RGB LEDS” Table below
0x1A
0-15 = RGB Type
Clip Launch 27
See “RGB LEDS” Table below
0x1B
0-15 = RGB Type
Clip Launch 28
See “RGB LEDS” Table below
0x1C
0-15 = RGB Type
Clip Launch 29
See “RGB LEDS” Table below
0x1D
0-15 = RGB Type
Clip Launch 30
See “RGB LEDS” Table below
0x1E
0-15 = RGB Type
Clip Launch 31
See “RGB LEDS” Table below
0x1F
0-15 = RGB Type
Clip Launch 32
See “RGB LEDS” Table below
0x20
0-15 = RGB Type
Clip Launch 33
See “RGB LEDS” Table below
0x21
0-15 = RGB Type
Clip Launch 34
See “RGB LEDS” Table below
0x22
0-15 = RGB Type
Clip Launch 35
See “RGB LEDS” Table below
0x23
0-15 = RGB Type
Clip Launch 36
See “RGB LEDS” Table below
0x24
0-15 = RGB Type
Clip Launch 37
See “RGB LEDS” Table below
0x25
0-15 = RGB Type
Clip Launch 38
See “RGB LEDS” Table below
0x26
0-15 = RGB Type
Clip Launch 39
See “RGB LEDS” Table below
0x27
0-15 = RGB Type
Clip Launch 40
See “RGB LEDS” Table below
0x30
0-7 = Track 1-8
RECORD ARM
0x31
0-7 = Track 1-8
SOLO
0x32
0-7 = Track 1-8
ACTIVATOR
0x33
0-7 = Track 1-8
TRACK SELECT
0x34
0-7 = Track 1-8
TRACK STOP
0x34
(E_3)
0-7 = Track 1-8
CLIP STOP
0=off, 1=on, 2=blink, 3-127=on
(Note: Blinking rate will sync to
TEMPO at 1/8)
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Note
Number
MIDI Channel
Corresponding
LED
Velocity
0x3A
(A#3)
DEVICE LEFT
0=off, 1-127=on
0x3B
(B_3)
DEVICE RIGHT
0=off, 1-127=on
0x3C
(C_4)
BANK LEFT
0=off, 1-127=on
0x3D
(C#4)
BANK RIGHT
0=off, 1-127=on
0x3E
(D_4)
DEVICE ON/OFF
0=off, 1-127=on
0x3F
(D#4)
DEVICE LOCK
0=off, 1-127=on
0x40
(E_4)
CLIP/DEVICE
VIEW
0=off, 1-127=on
0x41
(F_4)
DETAIL VIEW
0=off, 1-127=on
0X42
(F#4)
0-7 = Track 1-8
CROSSFADER
A/B
0=off, 1=Yellow, 2-127=Orange
0x50
(G#5)
MASTER
0=off, 1-127=on
0x51
STOP ALL
CLIPS
-none-
0x52
(A#5)
0-15 = RGB LEDs
Type (See table
below)
SCENE
LAUNCH 1
See “RGB LEDs” Table below
0x53
(B_5)
0-15 = RGB LEDs
Type (See table
below)
SCENE
LAUNCH 2
See “RGB LEDs” Table below
0x54
(C_6)
0-15 = RGB LEDs
Type (See table
below)
SCENE
LAUNCH 3
See “RGB LEDs” Table below
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Note
Number
MIDI Channel
Corresponding
LED
Velocity
0x55
(C#7)
0-15 = RGB LEDs
Type (See table
below)
SCENE
LAUNCH 4
See “RGB LEDs” Table below
0x56
(D_7)
0-15 = RGB LEDs
Type (See table
below)
SCENE
LAUNCH 5
See “RGB LEDs” Table below
0x57
(D#7)
PAN
0=off, 1-127=on
0x58
(E_7)
SENDS
0=off, 1-127=on
0x59
(F_7)
USER
0=off, 1-127=on
0x5A
(F#_7)
METRONOME
0=off, 1-127=on
0x5B
PLAY
0=off, 1-127=on
0x5D
RECORD
0=off, 1-127=on
0x5E
UP
-none-
0x5F
DOWN
-none-
0x60
RIGHT
-none-
0x61
LEFT
-none-
0x62
SHIFT
-none-
0x63
TAP TEMPO
-none-
0x64
NUDGE -
-none-
0x65
NUDGE +
-none-
0x66
SESSION
RECORD
0=off, 1-127=on
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RGB LEDs Type
MIDI Channel
Function
0
Primary Color
1
Secondary Color – Oneshot 1/24
2
Secondary Color – Oneshot 1/16
3
Secondary Color – Oneshot 1/8
4
Secondary Color – Oneshot 1/4
5
Secondary Color – Oneshot 1/2
6
Secondary Color – Pulsing 1/24
7
Secondary Color – Pulsing 1/16
8
Secondary Color – Pulsing 1/8
9
Secondary Color – Pulsing 1/4
10
Secondary Color – Pulsing 1/2
11
Secondary Color – Blinking 1/24
12
Secondary Color – Blinking 1/16
13
Secondary Color – Blinking 1/8
14
Secondary Color – Blinking 1/4
15
Secondary Color – Blinking 1/2
RGB LEDs
Name
Color
Velocity
60
#000000
0
59
#1E1E1E
1
58
#7F7F7F
2
57
#FFFFFF
3
1
#FF4C4C
4
2
#FF0000
5
3
#590000
6
4
#190000
7
5
#FFBD6C
8
6
#FF5400
9
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7
#591D00
10
8
#271B00
11
9
#FFFF4C
12
10
#FFFF00
13
11
#595900
14
12
#191900
15
13
#88FF4C
16
14
#54FF00
17
15
#1D5900
18
16
#142B00
19
17
#4CFF4C
20
18
#00FF00
21
19
#005900
22
20
#001900
23
21
#4CFF5E
24
22
#00FF19
25
23
#00590D
26
24
#001902
27
25
#4CFF88
28
26
#00FF55
29
27
#00591D
30
28
#001F12
31
29
#4CFFB7
32
30
#00FF99
33
31
#005935
34
32
#001912
35
33
#4CC3FF
36
34
#00A9FF
37
35
#004152
38
36
#001019
39
37
#4C88FF
40
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Akai APC40 Mk2 Communication Protocol
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38
#0055FF
41
39
#001D59
42
40
#000819
43
41
#4C4CFF
44
42
#0000FF
45
43
#000059
46
44
#000019
47
45
#874CFF
48
46
#5400FF
49
47
#190064
50
48
#0F0030
51
49
#FF4CFF
52
50
#FF00FF
53
51
#590059
54
52
#190019
55
53
#FF4C87
56
54
#FF0054
57
55
#59001D
58
56
#220013
59
0xED4325
#FF1500
60
0xBD6100
#993500
61
0xB08B00
#795100
62
0x85961F
#436400
63
0x539F31
#033900
64
0x0A9C8E
#005735
65
0x007ABD
#00547F
66
0x0303FF
#0000FF
67
0x2F52A2
#00454F
68
0x624BAD
#2500CC
69
0x7B7B7B
#7F7F7F
70
0x3C3C3C
#202020
71
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0xFF0505
#FF0000
72
0xBFBA69
#BDFF2D
73
0xA6BE00
#AFED06
74
0x7AC634
#64FF09
75
0x3DC300
#108B00
76
0x00BFAF
#00FF87
77
0x10A4EE
#00A9FF
78
0x5480E4
#002AFF
79
0x886CE4
#3F00FF
80
0xA34BAD
#7A00FF
81
0xB73D69
#B21A7D
82
0x965735
#402100
83
0xF66C03
#FF4A00
84
0xBFFB00
#88E106
85
0x87FF67
#72FF15
86
0x1AFF2F
#00FF00
87
0x25FFA8
#3BFF26
88
0x5CFFE8
#59FF71
89
0x19E9FF
#38FFCC
90
0x8BC5FF
#5B8AFF
91
0x92A7FF
#3151C6
92
0xB88DFF
#877FE9
93
0xD86CE4
#D31DFF
94
0xFF39D4
#FF005D
95
0xFFA529
#FF7F00
96
0xFFF034
#B9B000
97
0xE3F403
#90FF00
98
0xDBC300
#835D07
99
0xBE9D63
#392b00
100
0x89B47D
#144C10
101
0x88C2BA
#0D5038
102
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0x9BB3C4
#15152A
103
0x85A5C2
#16205A
104
0xC68B7C
#693C1C
105
0xF14080
#A8000A
106
0xFF94A6
#DE513D
107
0xFFA374
#D86A1C
108
0xFFEE9F
#FFE126
109
0xD2E498
#9EE12F
110
0xBAD074
#67B50F
111
0xA9A9A9
#1E1E30
112
0xD4FDE1
#DCFF6B
113
0xCDF1F8
#80FFBD
114
0xB9C1E3
#9A99FF
115
0xCDBBE4
#8E66FF
116
0xD0D0D0
#404040
117
0xDFE6E5
#757575
118
0xFFFFFF
#E0FFFF
119
Red
#A00000
120
Red Half
#350000
121
Green
#1AD000
122
Green Half
#074200
123
Yellow
#B9B000
124
Yellow Half
#3F3100
125
Amber
#B35F00
126
Amber Half
#4B1502
127
Outbound Message Type 2: Controller Value Update messages
Controls that report an absolute value for their position for inbound messages can have
their controller value updated via a Controller Value Update message. This will be done
using a MIDI controller message. The field normally associated with controller number will
be used to specify the Control ID. The field normally associated with controller value will
be used to update the value of a controller on the APC40 Mk2.
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Page 23
MIDI Controller message
Byte
Number
Value
Description
1
0xB<cha
n>
MIDI Controller. The 4-bit <chan> value will be used for the track
strips
2
<ControlI
D>
Identifier for control surface object
3
Data
Control value
Assignment of controller numbers to absolute controllers
Control
MIDI Channel
Control
ID
Notes
TRACK
FADER
0-7 = Tracks 1-8
0x07
TEMPO
KNOB
0x0D
MASTER
FADER
0x0E
CROSSFAD
ER
0x0F
DEVICE
KNOB 1
0-8 = Tracks 1-8,
Master
(for mode 0 only)
0x10
See “Interpretation of LED Ring Types”
DEVICE
KNOB 2
0-8 = Tracks 1-8,
Master
(for mode 0 only)
0x11
See “Interpretation of LED Ring Types”
DEVICE
KNOB 3
0-8 = Tracks 1-8,
Master
(for mode 0 only)
0x12
See “Interpretation of LED Ring Types”
DEVICE
KNOB 4
0-8 = Tracks 1-8,
Master
(for mode 0 only)
0x13
See “Interpretation of LED Ring Types”
DEVICE
0-8 = Tracks 1-8,
0x14
See “Interpretation of LED Ring Types”
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Akai APC40 Mk2 Communication Protocol
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Page 24
Control
MIDI Channel
Control
ID
Notes
KNOB 5
Master
(for mode 0 only)
DEVICE
KNOB 6
0-8 = Tracks 1-8,
Master
(for mode 0 only)
0x15
See “Interpretation of LED Ring Types”
DEVICE
KNOB 7
0-8 = Tracks 1-8,
Master
(for mode 0 only)
0x16
See “Interpretation of LED Ring Types”
DEVICE
KNOB 8
0-8 = Tracks 1-8,
Master
(for mode 0 only)
0x17
See “Interpretation of LED Ring Types”
DEVICE
KNOB 1
LED Ring
Type
0-8 = Tracks 1-8,
Master
(for mode 0 only)
0x18
0=off, 1=Single, 2=Volume Style, 3=Pan
Style, 4-127=Single
DEVICE
KNOB 2
LED Ring
Type
0-8 = Tracks 1-8,
Master
(for mode 0 only)
0x19
0=off, 1=Single, 2=Volume Style, 3=Pan
Style, 4-127=Single
DEVICE
KNOB 3
LED Ring
Type
0-8 = Tracks 1-8,
Master
(for mode 0 only)
0x1A
0=off, 1=Single, 2=Volume Style, 3=Pan
Style, 4-127=Single
DEVICE
KNOB 4
LED Ring
Type
0-8 = Tracks 1-8,
Master
(for mode 0 only)
0x1B
0=off, 1=Single, 2=Volume Style, 3=Pan
Style, 4-127=Single
DEVICE
KNOB 5
LED Ring
Type
0-8 = Tracks 1-8,
Master
(for mode 0 only)
0x1C
0=off, 1=Single, 2=Volume Style, 3=Pan
Style, 4-127=Single
DEVICE
KNOB 6
LED Ring
Type
0-8 = Tracks 1-8,
Master
(for mode 0 only)
0x1D
0=off, 1=Single, 2=Volume Style, 3=Pan
Style, 4-127=Single
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Control
MIDI Channel
Control
ID
Notes
DEVICE
KNOB 7
LED Ring
Type
0-8 = Tracks 1-8,
Master
(for mode 0 only)
0x1E
0=off, 1=Single, 2=Volume Style, 3=Pan
Style, 4-127=Single
DEVICE
KNOB 8
LED Ring
Type
0-8 = Tracks 1-8,
Master
(for mode 0 only)
0x1F
0=off, 1=Single, 2=Volume Style, 3=Pan
Style, 4-127=Single
CUE LEVEL
0x2F
TRACK
KNOB 1
0x30
APC40 Mk2 will light up ring LEDs
according to ring type
TRACK
KNOB 2
0x31
APC40 Mk2 will light up ring LEDs
according to ring type
TRACK
KNOB 3
0x32
APC40 Mk2 will light up ring LEDs
according to ring type
TRACK
KNOB 4
0x33
APC40 Mk2 will light up ring LEDs
according to ring type
TRACK
KNOB 5
0x34
APC40 Mk2 will light up ring LEDs
according to ring type
TRACK
KNOB 6
0x35
APC40 Mk2 will light up ring LEDs
according to ring type
TRACK
KNOB 7
0x36
APC40 Mk2 will light up ring LEDs
according to ring type
TRACK
KNOB 8
0x37
APC40 Mk2 will light up ring LEDs
according to ring type
TRACK
KNOB 1 LED
Ring Type
0x38
0=off, 1=Single, 2=Volume Style, 3=Pan
Style, 4-127=Single
TRACK
KNOB 2 LED
Ring Type
0x39
0=off, 1=Single, 2=Volume Style, 3=Pan
Style, 4-127=Single
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Page 26
Control
MIDI Channel
Control
ID
Notes
TRACK
KNOB 3 LED
Ring Type
0x3A
0=off, 1=Single, 2=Volume Style, 3=Pan
Style, 4-127=Single
TRACK
KNOB 4 LED
Ring Type
0x3B
0=off, 1=Single, 2=Volume Style, 3=Pan
Style, 4-127=Single
TRACK
KNOB 5 LED
Ring Type
0x3C
0=off, 1=Single, 2=Volume Style, 3=Pan
Style, 4-127=Single
TRACK
KNOB 6 LED
Ring Type
0x3D
0=off, 1=Single, 2=Volume Style, 3=Pan
Style, 4-127=Single
TRACK
KNOB 7 LED
Ring Type
0x3E
0=off, 1=Single, 2=Volume Style, 3=Pan
Style, 4-127=Single
TRACK
KNOB 8 LED
Ring Type
0x3F
0=off, 1=Single, 2=Volume Style, 3=Pan
Style, 4-127=Single
Footswitch
0x40
Interpretation of LED Ring Types
The LED rings will display its controller value with the LEDs based on the LED Ring Types.
This LED Ring Type can be set by the Host by sending an appropriate controller value
message. The “Min” and “Max” columns below will state the range of the controller value
that will match the LED states as shown in the “Display” column. The “LED STATES”
column below will show the state of each of the 15 LEDs going from left to right. A “0”
indicates that the LED within the LED ring is OFF. A “1” indicates that the LED within the
LED ring in ON.
A. SINGLE
MIN
MAX
LED STATES
0 3 100000000000000
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MIN
MAX
LED STATES
4 8 110000000000000
9
12
010000000000000
13
17
011000000000000
18
21
001000000000000
22
25
001100000000000
26
30
000100000000000
31
34
000110000000000
35
38
000010000000000
39
43
000011000000000
44
47
000001000000000
48
52
000001100000000
53
56
000000100000000
57
60
000000110000000
61
65
000000010000000
66
69
000000011000000
70
73
000000001000000
74
78
000000001100000
79
82
000000000100000
83
87
000000000110000
88
91
000000000010000
92
95
000000000011000
96
100
000000000001000
101
104
000000000001100
105
108
000000000000100
109
113
000000000000110
114
117
000000000000010
118
122
000000000000011
123
127
000000000000001
B. VOLUME STYLE
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Page 28
MIN
MAX
LED STATES
0 0 000000000000000
1 9 100000000000000
10
18
110000000000000
19
27
111000000000000
28
36
111100000000000
37
45
111110000000000
46
54
111111000000000
55
63
111111100000000
64
71
111111110000000
72
80
111111111000000
81
89
111111111100000
90
98
111111111110000
99
107
111111111111000
108
116
111111111111100
117
126
111111111111110
127
127
111111111111111
C. PAN STYLE
MIN
MAX
LED STATES
0 8 111111110000000
9
17
011111110000000
18
26
001111110000000
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Page 29
MIN
MAX
LED STATES
27
35
000111110000000
36
44
000011110000000
45
53
000001110000000
54
62
000000110000000
63
64
000000010000000
65
73
000000011000000
74
82
000000011100000
83
91
000000011110000
92
100
000000011111000
101
109
000000011111100
110
118
000000011111110
119
127
000000011111111
Communications from device to PC Host - “Inbound” messages
These messages will be used to report control surface events from the device to the PC
Host and as a response to requests from the PC host.
Inbound Standard MIDI Message types
These messages will use standard MIDI messages.
Each message type will contain a Control Identifier field, which will identify the control
surface object to which the message pertains.
Each message type will contain a data field, which may contain information about either
the new value of the control surface object or how it has changed since the last report.
Type NOTE1: Note-on/Note-off messages
Some devices (such as buttons) have two states and the transitions between these states
will be reported using MIDI note-on (when the button is depressed) and note-off (when the
button is released). The field normally associated with note number will be used to specify
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the Control ID.
Midi note-on messages
Byte
Number
Value
Description
1
0x9<chan
>
MIDI Note-on. The 4-bit <chan> value will be used for the track
strips.
2
<ControlI
D>
Identifier for control surface object (“note number”)
3
0x7F
Control value (non-zero)
Midi note-off messages
Byte
Number
Value
Description
1
0x8<chan
>
MIDI Note-off. The 4-bit <chan> value will be used for the track
strips
2
<ControlI
D>
Identifier for control surface object (“note number”)
3
0x7F
Control value (ignored)
Assignment of note numbers to buttons. Note 0x30 to 0x49 use MIDI Channel 0 to 7 to
indicate Tracks 1-8. All other note values ignore the MIDI Channel. In Mode 1 or Mode 2,
all buttons act as momentary buttons.
Control
MIDI Channel
Note
Number
CLIP LAUNCH 1
0x00
CLIP LAUNCH 2
0x01
CLIP LAUNCH 3
0x02
CLIP LAUNCH 4
0x03
CLIP LAUNCH 5
0x04
CLIP LAUNCH 6
0x05
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Page 31
CLIP LAUNCH 7
0x06
CLIP LAUNCH 8
0x07
CLIP LAUNCH 9
0x08
CLIP LAUNCH 10
0x09
CLIP LAUNCH 11
0x0A
CLIP LAUNCH 12
0x0B
CLIP LAUNCH 13
0x0C
CLIP LAUNCH 14
0x0D
CLIP LAUNCH 15
0x0E
CLIP LAUNCH 16
0x0F
CLIP LAUNCH 17
0x10
CLIP LAUNCH 18
0x11
CLIP LAUNCH 19
0x12
CLIP LAUNCH 20
0x13
CLIP LAUNCH 21
0x14
CLIP LAUNCH 22
0x15
CLIP LAUNCH 23
0x16
CLIP LAUNCH 24
0x17
CLIP LAUNCH 25
0x18
CLIP LAUNCH 26
0x19
CLIP LAUNCH 27
0x1A
CLIP LAUNCH 28
0x1B
CLIP LAUNCH 29
0x1C
CLIP LAUNCH 30
0x1D
CLIP LAUNCH 31
0x1E
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CLIP LAUNCH 32
0x1F
CLIP LAUNCH 33
0x20
CLIP LAUNCH 34
0x21
CLIP LAUNCH 35
0x22
CLIP LAUNCH 36
0x23
CLIP LAUNCH 37
0x24
CLIP LAUNCH 38
0x25
CLIP LAUNCH 39
0x26
CLIP LAUNCH 40
0x27
RECORD ARM
0x30 (C_3)
SOLO
0x31 (C#3)
ACTIVATOR
0x32 (D_3)
TRACK
SELECTION
0x33 (D#3)
TRACK STOP
0x34 (E_3)
DEVICE LEFT
0x3A
DEVICE RIGHT
0x3B
BANK LEFT
0x3C
BANK RIGHT
0x3D
DEVICE ON/OFF
0x3E
DEVICE LOCK
0x3F
CLIP/DEVICE
VIEW
0x40
DETAIL VIEW
0x41
CROSSFADER
A/B
0x42
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Page 33
CLIP STOP
0-7 = Track 1-8
MASTER
0x50 (G#5)
STOP ALL CLIPS
0x51 (A_5)
SCENE LAUNCH
1
0x52 (A#5)
SCENE LAUNCH
2
0x53 (B_5)
SCENE LAUNCH
3
0x54 (C_6)
SCENE LAUNCH
4
0x55 (C#6)
SCENE LAUNCH
5
0x56 (D_6)
METRONOME
(8)
0-8 = Tracks 1-8,
Master
(for mode 0 only)
0x41 (F_4)
PAN
0x57 (D#6)
SENDS
0x58 (E_6)
USER
0x59 (F_6)
METRONOME
0x5A (F#6)
PLAY
0x5B (G_6)
STOP
0x5C
(G#6)
RECORD
0x5D (A_6)
UP
0x5E (A#6)
DOWN
0x5F (B_6)
RIGHT
0x60 (C_7)
LEFT
0x61 (C#7)
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Page 34
SHIFT
0x62 (D_7)
TAP TEMPO
0x63 (D#7)
NUDGE -
0x64 (E_7)
NUDGE +
0x65 (F_7)
SESSION
RECORD
0x66
BANK LOCK
0x67
Type CC1: Absolute Controller messages
Most controls will report an absolute value for their position. This will be done using a MIDI
controller message. The field normally associated with controller number will be used to
specify the Control ID. The field normally associated with controller value will be used to
report the absolute control value.
MIDI Controller message
Byte number
Value
Description
1
0xB<chan>
MIDI Controller. The 4-bit <chan> value will be used
for the track.
2
<ControlID>
identifier for control surface object
3
data
control value
Assignment of controller numbers to absolute controllers
Control
MIDI Channel
Control ID
Notes
TRACK FADER
0-7 = Tracks 1-8
0x07
MASTER FADER
0x0E
CROSSFADER
0x0F
DEVICE KNOB 1
0-8 = Tracks 1-8, Master
(for Mode 0 only)
0x10
DEVICE KNOB 2
0-8 = Tracks 1-8, Master
0x11
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Control
MIDI Channel
Control ID
Notes
(for Mode 0 only)
DEVICE KNOB 3
0-8 = Tracks 1-8, Master
(for Mode 0 only)
0x12
DEVICE KNOB 4
0-8 = Tracks 1-8, Master
(for Mode 0 only)
0x13
DEVICE KNOB 5
0-8 = Tracks 1-8, Master
(for Mode 0 only)
0x14
DEVICE KNOB 6
0-8 = Tracks 1-8, Master
(for Mode 0 only)
0x15
DEVICE KNOB 7
0-8 = Tracks 1-8, Master
(for Mode 0 only)
0x16
DEVICE KNOB 8
0-8 = Tracks 1-8, Master
(for Mode 0 only)
0x17
DEVICE KNOB 1
0-8 = Tracks 1-8, Master
(for mode 0 only)
0x18
DEVICE KNOB 2
0-8 = Tracks 1-8, Master
(for mode 0 only)
0x19
DEVICE KNOB 3
0-8 = Tracks 1-8, Master
(for mode 0 only)
0x1A
DEVICE KNOB 4
0-8 = Tracks 1-8, Master
(for mode 0 only)
0x1B
DEVICE KNOB 5
0-8 = Tracks 1-8, Master
(for mode 0 only)
0x1C
DEVICE KNOB 6
0-8 = Tracks 1-8, Master
(for mode 0 only)
0x1D
DEVICE KNOB 7
0-8 = Tracks 1-8, Master
(for mode 0 only)
0x1E
DEVICE KNOB 8
0-8 = Tracks 1-8, Master
(for mode 0 only)
0x1F
CUE LEVEL
0x2F
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Page 36
Control
MIDI Channel
Control ID
Notes
TRACK KNOB 1
0x30
TRACK KNOB 2
0x31
TRACK KNOB 3
0x32
TRACK KNOB 4
0x33
TRACK KNOB 5
0x34
TRACK KNOB 6
0x35
TRACK KNOB 7
0x36
TRACK KNOB 8
0x37
TRACK KNOB 1
0x38
TRACK KNOB 2
0x39
TRACK KNOB 3
0x3A
TRACK KNOB 4
0x3B
TRACK KNOB 5
0x3C
TRACK KNOB 6
0x3D
TRACK KNOB 7
0x3E
TRACK KNOB 8
0x3F
Footswitch
0x40
Value of 0x7F when depressed
and a value of 0x00 when
released
Type CC2: Relative Controller messages
Some controls will report a relative change in their value. This will be done using a MIDI
controller message. The field normally associated with controller number will be used to
specify the Control ID. The field normally associated with controller value will be used to
report the change in the control value.
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Page 37
MIDI Controller message
Byte
Number
Value
Description
1
0xB<chan>
MIDI Controller. The 4-bit <chan> value will be used for the
track strips
2
<ControlID>
identifier for control surface object
3
data
control change
Interpretation of MIDI Controller values for Relative Controllers
The value in the data field will indicate a relative change; values 01 to 63 describe a
positive change and values 127 down to 64 describe a negative change.
Data Value Sent
Interpretation
0x00
No change occurred. Control is stationary.
0x01
The controller incremented its value by 1 since the last report
0x02
The controller incremented its value by 2 since the last report
...
...
0x3f
The controller incremented its value by 63 since the last report
0x40
The controller decremented its value by 64 since the last report
0x41
The controller decremented its value by 63 since the last report
...
...
0x7e
The controller decremented its value by 2 since the last report
0x7f
The controller decremented its value by 1 since the last report
Assignment of controller numbers to relative controllers
Control
Control ID
Notes
CUE LEVEL
0x2F
TEMPO KNOB
0x0D
Page 38
Akai APC40 Mk2 Communication Protocol
Version 1.2 – January 19, 2015
Page 38
Document History
Date
Author
January 7, 2015
First Draft based on APC40 Communications
Protocol document
Kris Stevenson
January 8, 2015
Revisions made to 1st draft after review with
Eng.
Kris Stevenson
January 19, 2015
Tempo Knob removed from Absolute
Controller Messages table on p36 and added
to Relative Controller Messages table on p39.
Kris Stevenson
January 19, 2015
Added Track Activator, Crossfader A/B, Track
Solo, Track Record, Bank, Play, Record,
Session Record, Pan, Sends, User, and
Metronome button types to Outbound
Message Type: Generic Mode on p12-13.
Kris Stevenson
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