Sorry for the delay!
No problem, nothing in my life depends from Impulse 61 since I do not have it
"Have you tried to set MIDI track to channel 1 (in the track inspector, where you have "C: None")?"
Maybe I'm misunderstanding, but that doesn't seem to work. If I set c: to channel 1 and the Impulse is NOT set to channel 1, then I get nothing. If I then set the impulse to channel 1, we're right back where we started with no modwheel.
There is some misunderstanding... I attach a picture. So in the upper part I set the channel (on this picture "channel 4 for Sampletank") and in lower part I set input to Omni.
My MPK mini was set to channel 16, as also indicated by Sampletank till I set the channel.
So, in total I have configured Sampletank (one instance) with Drums in the channel 1, Bass in the channel 2 and Piano in the channel 4. I have created 3 MIDI tracks, routed to Sampletank, and set channels in all 3. My controller is on channel 16. As soon as I focus specific track, I can play/record particular instrument. I do not switch controller, just focus track with mouse.
If that does not work for you, there is some problem in your setup.
For the test:
5. Press "Mixer button". Do you see Last MIDI Event for it? Does LED for Mixer lit? Is LED for MIDI button still there?
6. Move fader 1 again. Is it back to ch:1 cc:0 ?
Overall questions are the following (I want you understand why I am asking all that):
* Do Mixer/MIDI buttons change what faders send ? In one direction or in both?
* Do they both also inform DAW there are operated?
* Do they also operate LEDs on there own?