Archive of the former Yahoo!Groups mailing list: Korg Poly800/EX800 Users

Keep in mind that the existing master clock that goes into the tone generator is VCO controlled by joystick and modulation. We need to keep all of that intact.

VCO?  Did you mean just VC?



We should also keep the same EG design thatuses a VCA technique that plugs 0-5 volt into the MSM5232 to control each voice output level. So the design would require accepting a 0-5 volt signal for VCA control.


would you use new DAC's or extend some kind of S&H lines to send the v signal and use the existing DAC?



I'm checking into existing open source coded PICs as voice gen's and cannot seem to find that ONE to be even a little close to the requirements.  I do see the code to get 8bit waveforms to playback and how to make your own, vs. the typical saw/triangle etc waveforms.
Alot like a DW8000 or Kawai K3 is how they can sound, is my guess.

  The 16F pics are dirt cheap and would probably be the best to use for an affordable project that is 6-8voices.

output from the PIC seems to be either PWM for easy connection to a speaker or a filter system for 1 bit conversion.


There are a few ARM uC's used in open source projects.  And there's also a DX7 copy FM uC open project out there as well.   I believe all of them are 8bit waveform outputs.


I would have assumed a daughter board connection into the Poly's Filter IC would be a good "mix" connection for the voices, then relocate the filter IC to the new board.