Python scripts that puts a rainbow fade on the novation launchkey 25 MK2 LED-lights. Original script was written by David Madison (https://www.partsnotincluded.com/how-to-control-the-leds-on-a-novation-launchkey-mini-ii/)

launchkey_25_MK2_clone_hero_drums.py

#
# Launchkey Mini II Sweep Animation
# by David Madison © 2018
# www.partsnotincluded.com
#

#
# Modified to work for the Launchkey 25 MK2.
# Instead of the original sweep, it now displays
# a looping rainbow fade. 
# Modifications by Klepvink
# https://github.com/Klepvink
#

#
# Modified to work for Clone Hero drums
# Added iterate_over_colors, available devices popup, 
# global config variables, finally statement & pre-preq instructions
# And of course, set the drums to their respective colour, and the kick zone to a neutral colour
# Modifications by Denperidge
# https://denperidge.com
#

"""
Python dependencies

Either
  pip install mido python-rtmidi
or
  nix-shell -p python312 python312Packages.mido python312Packages.python-rtmidi
"""

import mido
from time import sleep


print("Available Devices")
print(mido.get_output_names())

PORT = "Launchkey MK2 25:Launchkey MK2 25 Launchkey InCo 24:1"
NEUTRAL = 3

# Colors, numbers for the LED's and further information are
# obtained via the MK2 Programmers Reference guide written
# by Danny Nugent. See https://resource.novationmusic.com/sites/default/files/novation/downloads/10535/launchkey-mk2-programmers-reference-guide.pdf

chunk1 = (40, 41, 36, 37)
chunk2 = (42, 43, 38, 39)
chunk3 = (48, 49, 44, 45)
chunk4 = (50, 51, 46, 47)

row1 = (40, 41, 42, 43, 48, 49, 50, 51)
row2 = (36, 37, 38, 39, 44, 45, 46, 47)


all_rows = row1 + row2
all_leds = chunk1 + chunk2 + chunk3 + chunk4 

def write_led(led_id, color_vel):
    midi_out.send(mido.Message('note_on', channel=15,
                  note=led_id, velocity=color_vel))

def iterate_over_colors():
    i = 0
    try: 
        while True:
            print(i)
            write_led(row2[7], i)
            sleep(0.5)
            i = i+1
    except KeyboardInterrupt:
        pass


if __name__ == "__main__":
    try:
        # Launchkey InControl port
        midi_out = mido.open_output(PORT)
        # Switch to "InControl" mode
        midi_out.send(mido.Message.from_bytes([0x90, 0x0C, 0x7F]))


        while True:
            write_led(row2[0], NEUTRAL)
            write_led(row1[0], NEUTRAL)
            write_led(row1[1], NEUTRAL)

            write_led(row2[1], 5)  # red

            write_led(row2[2], 13)  # yellow
            write_led(row1[2], 15)  # yellow cymbal

            write_led(row2[3], NEUTRAL)
            write_led(row1[3], NEUTRAL)
            write_led(row2[4], NEUTRAL)
            write_led(row1[4], NEUTRAL)


            write_led(row2[5], 42)  # blue
            write_led(row1[5], 37)  # blue cymbal

            write_led(row2[6], 21)  # green
            write_led(row1[6], 20)  # green cymbal

            write_led(row2[7], NEUTRAL)
            write_led(row1[7], NEUTRAL)

            sleep(0.5)


    except KeyboardInterrupt:
        pass
        # Uncomment the line below to enable iterate after the first keyboard interrupt
        #iterate_over_colors()

    

    finally:
        for led in all_leds:
            write_led(led, 0)  # Turn off all LEDs
        # Disable "InControl" mode
        midi_out.send(mido.Message.from_bytes([0x90, 0x0C, 0x00]))
        midi_out.close()