Separate names with a comma.
Yes, getting a separate cv source is crucial to maximizing the CP251, such as that envelope out.
If you have a midi in to your computer you should download midi monitor or similar. That way you can see what message your pedal is truly putting...
Having no midi out makes troubleshooting harder imo.
I will assume you checked the usual culprits first:
MIDI cable is good
Controller is sending data
MIDI channels are the same
This is confirmed on...
What's that Moog recycle box do?
How's that Korg sequencer play with the Moogs?