Just copying my reply here so other users can see it too (instead of our private email conversation).
The screen shots attached show a basic setup for 1 button.
- MIDI designer is set to all defaults
- Add a new button
- Double tap to get to the properties: Change subtype to Momentary.
- Switch to the MIDI tab
- Select Message Type: Control Change and for this example Channel 1, CC 21
Now go to Quantiloop, and create a MIDI control assignment as shown in the picture.
You can either manually set all the values or learn the button from MDP
That should do the job. Please let us know if this works.