Like someone mentioned below, I too am very impressed with the SID synth engine. I've been building analog synths for a while, and I came accross MIDIBox for the MBCV interface. After building it, I was interested in expanding the polyphonic functionality...and noticed comments in the ASM that eluded to making things more like the MBSID. After reviewing the SID I was blown away by the concept and implementation.
So I'd like to explore the options of adapting the MBSID engine to a complete analog synth. The concept here being able to not only take adavantage of the modulation subsystem...but also of the patching and overall synth management functions.
I realize there are quite a few external interface options allready present...but I'd like to have more flexibility and control over the synthesis portion..ie...some freedom from the SID chip will style enjoying the awesome MBSID engine.
Two possibilities come to mind. The first would be to develop a comm interface (perhaps PIC) to emulate the SID...essentially converting the SID control data back out to analog CV's and digital CMOS switches. This would have the advantage of being compatable with future MBSID releases...i.e leaving the original MBSID code unmodified.
The second, would be some modification of the MBSID itself to support more AOUTs and DOUTs to drive the analog synth.
Regardless of the method, the analog synth itself would be modeled after the internal SID block (or more precisely after the SID interface): 3 OSCs with TRI,SAW,SQR, and NOISE waves/ Pitch and PW CV, 3 VCAs with CV, 3 ADSRs with full CV, and Multimode Filter with Cutoff and Res CVs.
I searched the forums and didn't find anything similar...so I apologize in advance if this has allready been covered.
I'd greatly appreciate and input, ideas, or advice.
Thanks,
Dave Strength