I am in the process of adding note velocity on my VolcaFM and while I was reversing the schematics I couldn't stop noticing similarities with a PreenFM2.
MIDI Keys Velocity for Korg VolcaFM Both devices use an ARM Cortex-M4 so the PreenFM2 firmware could be ported (in theory) to a VolcaFM. Of course the original code will be lost
forever. The Volca uses a companion processor to read the touch keys and the protocol could be quickly reversed by hooking a logic analyzer on the SPI connector. The Volca doesn't have a nice screen, only a 9x7-segment display and neither it has the USB connectivity or pen drive interface. Instead is has a stereo 24-bit DAC.
What do you think; is it worth the effort to port this firmware to a Volca?
The Volca's firmware can be updated via an audio file played from the computer. I'll have a look in the future to see if that can be reversed so we could save the original firmware. Or maybe they've forgotten to fuse protect their Spansion FM4 processor.
