Machinedrum volume control issues via MIDI

Hello people,

Have any Machinedrum owners tried using external midi controllers for volume control over MD tracks?
I recently mapped controls for both MD and OT on a single preset from my Novation SL-MKII’s knobs & sliders,
the OT works fine, but the MD starts to function as in ‘classic’ mode - plays back the sequences without parameter locks, which is a real pity.
I have the older SPS-1 MKI version. Any solutions? I think I’ve tried everything, no results.

Thanks,
Roberts