Yamaha CS80

My biggest mod plans are to replace all the custom chips with equivalent 
discrete circuits.  For a voice board, it will be mostly surface-mount 
parts in order to keep the board the same size as the originals.  Same 
goes for the KAS board (key assigner), though that one won't have to be 
surface-mount parts.

  Auto-tune won't happen unless a key assigner with higher resolution 
DACs is made such that micro-tonal tuning of the pitch CVs can be done.  
That, and a feedback circuit to listen to each channel's oscs, along with 
a "silencer" VCA placed in the audio output circuit so the horrendous 
squawking the machine would make while running a tune algorithm is 
avoided.

  I'm going to try and avoid the issue with new VCO circuits that don't 
have tracking issues. ;)

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