The keys seem to always play the CV/gate regardless of the channel sent to MIDI out by the keyboard and the channel received from MIDI in by the CV/gate. This means you can’t use Keystep as a controller keyboard and MIDI/CV at the same time.
Two ways I think this could be resolved are:
1. A switch so that the keys only play the CV when the channels match (key channel is trivial to change shift+key)
2. A local off switch