I found the “programmer’s reference manual” for the launchkey mk3 and it seems that everything is well documented in there - but it doesn’t mean that it is easy to understand…
So, i have to say “sorry” but having had a quick view over the first few pages, i’m sure that i won’t be able to solve your issue because i don’t own that device myself, to try things out… starting to code something just “into the blue” seems not to be effective at all and would burn lots of time and nerves on either side.
What i did understand from that manual:
- the launchkey uses two diffrent pairs of midi ports: One for playing/Performance and one for DAW control/communication! You’d have to work with the DAW port! It communicates on midi CH16!
- There is a “Standalone MIDI mode” and a “DAW mode” - You’d have to switch the device to “DAW mode” first to be able to communicate with its controls!
- There are various additional modes for the pads, pots and faders, which would make them behave diffrently - i guess, you’d have to switch the control-element to the desired mode!
That’s the only advice i can give you with that device!
Here is yet a maybe useful quote from page 7
SysEx message format used by the device
All SysEx messages begin with the following header regardless of direction (Host => Launchkey MK3
or Launchkey MK3 => Host):
Hex: F0h 00h 20h 29h 02h 0Fh
Dec: 240 0 32 41 2 15
After the header, a command byte follows, selecting the function to use.
I once succeed in helping someone else with an Akai controller, but the manual was much easier to grasp than the one of the Launchkey… however, maybe you can find some pieces of useful information or a general idea of how to approach all that by reading through that thread:
Good luck with getting everything to work as you want it to!