Here is some news on the current development.
Today I'm focus on the PC version, but I keep it compatible with the dingoo psp and gp2x.
I've implemented the helm sound engine from matt tytel, you can double check it here it is a really great soft synth : http://tytel.org/helm/
I have now a beta sync in the base code for the volca which can use one left or right audio output to send a sync signal.
Yesterday I have implemented a midi output on Linux with RtMidi and I can send noteOn/NoteOff/midiCC to the volca bass and volca keys.
Still in early alpha because it was coded in one afternoon but it's really fun to be able to use internal sound and external gears.
If you want to play with the source i recommend to DL the last git tag 0.60 if I remember correctly.
In the end on the handled side I think the psp will be the best version because it had hard floating point support and the pbsynth sound great with it. But after 15 minute I had crash so I think I have a something wrong in the design which need to be track before releasing anything new on the handled side. Gp2x is powerful enough but I have to speed up my engine.
Dingoo works fine but I want it to be smoother, so profiling and speeding up all sound engine.
Johann