Pajen unofficial firmware
utilityreddit.com
Pajen's unofficial firmware is a community-made replacement system firmware for the original Korg volca fm. Its main addition is velocity response to incoming MIDI notes, switchable in the global settings, and it fixes several LFO problems, including sample-and-hold scaling and update timing, an inverted modulation sign and an audible digital pop. Further global settings choose between Yamaha-compatible and original patch import and export behaviour and let held notes keep sounding when the patch changes. MIDI program changes select both patches and patterns, and added MIDI CCs switch the chorus and set its width and speed, load patches and patterns, set a tempo divisor and remap the mod wheel. It installs through the volca's standard firmware update procedure, and installation is at the user's own risk.