Modular PO-16 TRACKS CV/GATES not all working?

While I really enjoy interfacing the Modual PO-16 with my Serge via the CV/Gate outputs, I can’t seem to get the other outputs to work (the midi is fine). Keyboard sensitivity sucks so perhaps I’m not pushing hard enough to actually change from TRK 1 to 2,3,4 or KB? Any suggestions?