What worked for me:
- Start the Volca with FUNC pressed, to get into global settings mode
- Push key 4 for switching the sync in polarity to “falling” (lit up)
- Push REC to store the settings
On double check, it was “falling” not “rising”, I misread and rising is actually the factory default. Here’s the table from the manual:
Please let me know if this setting works for you too! I haven’t extensively tested it, just let it run for a couple minutes once and it didn’t seem to mess up any more.
While I was at it, I also changed the sync out polarity (I figured that when I want for the Volca to be the clock source for the POs, that would probably be better too) and the tempo range (more is better IMHO, I’m also looking forward to building ambient type stuff with really low bpm).