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. ;)
Crow
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