Modifier Firmware for the RK-002 (former Volca FM)

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Desktop MIDI Interface

Select MIDI Out interface:
Select interface
Select interface

Note: Devices like the Arturia Keystep/Beatstep pro are showing up like MIDI devices but they do not pass MIDI SysEx messages thus can not be used to update/set the RK-002. If you want to try and extract some individual patches from your DX7 Soundbanks, you can try our DX7 patch extractor here

Performance mapping

MIDI response channel:
Select MIDI channel
PolyMUX *1:
Extra MIDI channels
PolyMUX expands device polyphony by spreading played notes over extra MIDI channels. The RK-002 MIDI Response channel is the base channel. Select the extra amount of MIDI Channels in the PolyMUX dropdown. E.G. on a 3-voice polyphonic device, setting one extra PolyMUX channel doubles the polyphony to 6.

* firmware v35+
*1 firmware v43+
*2 firmware v49+ e.g. try 'carrier decay'

MIDI Real-Time/Channel Filter

MIDI Clock filter

MIDI Channel filter



If you want to download the small sysex files which allow the settings to be set offline from a PC/Mac program like MIDI-Ox or Sysex Librarian, you can download them here

Updating to this firmware will keep other firmware's settings in RK-002 memory so you can swap back without problems.