Hello all, I wrote a blog post on the modifications I did to my Yamaha CS01. Variable resonance, VCA EG / Gate modes, extra 'combined' waveforms and two modulation buses with LFO, VCO and noise modulation sources. You can now do filter FM and noise modulation sounds on this CS01. http://rga24.blogspot.com/2010/06/yamaha-cs01.html