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a bit late perhaps but now i see what the problem is with that novation launchkeys: it sends MIDI CC when you press and when you release the key or button. i'm afraid this behavior is not well coped for toggle subjects (eg. mute, solo, etc) not matter the "Latch" or "Hook" options are set: the target subject will turn on on press and off immediately when you release the (launch)key.

are you sure it isn't possible to change this behavior on the MIDI controller side? i mean some configuration option or else that you can set appropriately? maybe make it send MIDI note-on and note-off events instead of CC's which is I believe is the most appropriate for the kind of key press (note-on) and release (note-off) operation? if yes, you could set it to note-on only and set the "Latch" mode giving it the way to toggle the subject on each key press.

hth.
byee