# Mackie emulation for the AKAI APCmini

# Copyright (c) 2018 Albert Graef <aggraef@gmail.com>

# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty provided the copyright notice and
# this notice are preserved.  This file is offered as-is, without any
# warranty.

JACK_NAME "midizap-APCmini"
JACK_PORTS 2

# This turns the APCmini into a Mackie-compatible controller, so that it can
# be used with Linux DAW programs like Ardour. The emulation is complicated by
# the APCmini having no encoders, no motorized faders, and not nearly as many
# dedicated buttons as a Mackie device. But it offers enough controls to be
# usable as a basic DAW controller. I tested it with Ardour.

# SETUP: In Ardour, enable the Mackie control surface, then connect Ardour's
# "mackie control" ports to midizap's midi_out and midi_in2 ports, and the
# APCmini to midizap's midi_in and midi_out2 ports.

# "BLINKENLIGHTS" ADD-ON: Decoding MCU metering feedback is beyond midizap's
# capabilities, but there's a Pd patch in APCmini-meter.pd which you can hook
# up to Ardour's Mackie control output to show the channel meters in the
# unused top 5x8 button grid.

# PROTOCOL DOCUMENTATION: The Mackie protocol is fairly ubiquitous, but since
# the manufacturers can't be bothered to properly *document* their stuff these
# days, we have to rely on volunteers who do their work using some reverse
# engineering. Here are the links that I found most useful:

# http://www.budgetfeatures.com/XctlDOC/Xctl Protocol for X-Touch V1.0.pdf

# (This chart really is a piece of art. It's actually about the Behringer
# X-Touch, but since that device is MCU-compatible, there's a wealth of useful
# information in there; just ignore the bits which pertain to Xctl.)

# There's another fairly comprehensive one here:

# http://www.jjlee.com/qlab/Mackie Control MIDI Map.pdf

# Information about the APCmini can be found in the Akai forums here:
# http://community.akaipro.com/akai_professional/topics/midi-information-for-apc-mini

[MIDI]

# The APCmini's dedicated shift key is used to provide alternative functions
# to some of the buttons and the faders.
?D8 SHIFT RELEASE SHIFT

# transport (assigned to the topmost 5 "scene launch" buttons on the right)
A#6 A7  # Stop
B6  A#7 # Play
C7  B7  # Rec
#C7  C#7  # Cycle
C#7 G7  # Rew
D7  G#7 # FFwd

# the next three buttons below are used for the MCU shift keys
# NOTE: The MCU actually has four shift keys, so one has to go. You may want
# to rearrange these as needed.
D#7 A#5 # Shift
E7  B5  # Control
F7  C6  # Option
#F7  C#6 # Alt/Cmd

# shifted "scene launch" buttons
# We assign these to the function keys F1..F8 here, but of course you can
# remap these as needed.
^A#6 F#4
^B6  G4
^C7  G#4
^C#7 A4
^D7  A#4
^D#7 B4
^E7  C5
^F7  C#5

# bottom 3x8 grid: mute/solo/rec
# NOTE: Incidentally, these happen to be identical to corresponding MCU input.

# rec (bottom row of the grid)
C0  C0
C#0 C#0
D0  D0
D#0 D#0
E0  E0
F0  F0
F#0 F#0
G0  G0

# solo (next row above)
G#0 G#0
A0  A0
A#0 A#0
B0  B0
C1  C1
C#1 C#1
D1  D1
D#1 D#1

# mute (next row above)
E1  E1
F1  F1
F#1 F#1
G1  G1
G#1 G#1
A1  A1
A#1 A#1
B1  B1

# track select (bottom row right above the faders)
E5  C2
F5  C#2
F#5 D2
G5  D#2
G#5 E2
A5  F2
A#5 F#2
B5  G2

# shifted bottom row
# We have these assigned to the bank/channel and track/pan/send/instr controls,
# but you may want to remap some or all of these as needed.
^E5  A#3 # Bank Left
^F5  B3  # Bank Right
^F#5 C4  # Channel Left
^G5  C#4 # Channel Right
# NOTE: Only Pan and Send appear to be supported in Ardour.
^G#5 E3  # Track (Volume)
^A5  F#3 # Pan
^A#5 F3  # Send
^B5  A3  # Instr (Device)

# faders (MCU uses pitch bends here, use 129 as step size to get full range)
CC48= PB[129]-1
CC49= PB[129]-2
CC50= PB[129]-3
CC51= PB[129]-4
CC52= PB[129]-5
CC53= PB[129]-6
CC54= PB[129]-7
CC55= PB[129]-8
# master fader
?CC56= PB[129]-9

# faders become encoders when shifted (CC16..CC23, incremental mode)
^CC48= CC16~
^CC49= CC17~
^CC50= CC18~
^CC51= CC19~
^CC52= CC20~
^CC53= CC21~
^CC54= CC22~
^CC55= CC23~

# feedback section ########################################################

[MIDI2]

# transport (will light up in green)
A7  A#6
A#7 B6
B7  C7[2] # Rec, blinks when engaged
#C#7 C7 # Cycle
G7  C#7
G#7 D7

# MCU shift keys
A#5 D#7
B5  E7
C6  F7

# meter feedback

# The Mackie protocol packs all 8 channel meters into a single channel
# pressure message which we need to transform into the corresponding
# note messages for the LEDs.  Note that we only use the upper 5x8 part
# of the grid here, in order not to clobber the 3 rows at the bottom
# with the rec/solo/mute buttons.  This means that the meters, which
# actually have 8 different values, have to be squashed into 5 LEDs per
# channel.

?CP[16] C2[0,1] G#2[0,0,0,1] E3[0,0,0,0,0,5] C4[0,0,0,0,0,0,0,5] G#4[0,0,0,0,0,0,0,0,3]

# Here's an alternative decoding, which creates horizontal meters
# covering the full range, with the first channel on top.  Note,
# however, that this ranges across the entire 8x8 grid and will thus
# clobber the rec/solo/mute controls!

#?CP[16][-8] G#4[0,1] A4[0,0,1] A#4[0,0,0,1] B4[0,0,0,0,1] C5[0,0,0,0,0,5] C#5[0,0,0,0,0,0,5] D5[0,0,0,0,0,0,0,5] D#5[0,0,0,0,0,0,0,0,3]

# no feedback for faders (faders aren't motorized)

# NOTE: Feedback for rec/solo/mute/select also needs to be recognized in shift
# mode, so that the (shifted) bank/channel left/right keys work as expected.

# rec: color = red (vel. 3)
?C0  C0[3]
?C#0 C#0[3]
?D0  D0[3]
?D#0 D#0[3]
?E0  E0[3]
?F0  F0[3]
?F#0 F#0[3]
?G0  G0[3]

# solo: color = green (vel. 1)
?G#0 G#0[1]
?A0  A0[1]
?A#0 A#0[1]
?B0  B0[1]
?C1  C1[1]
?C#1 C#1[1]
?D1  D1[1]
?D#1 D#1[1]

# mute: color = yellow (vel. 5)
?E1  E1[5]
?F1  F1[5]
?F#1 F#1[5]
?G1  G1[5]
?G#1 G#1[5]
?A1  A1[5]
?A#1 A#1[5]
?B1  B1[5]

# select (will light up in red)
# NOTE: Ardour apparently doesn't update these when changing banks.
?C2  E5
?C#2 F5
?D2  F#5
?D#2 G5
?E2  G#5
?F2  A5
?F#2 A#5
?G2  B5