Wondering what modifications you might have seen / had done / thought of for CS80s and how useful they were. Some obvious ones are MIDI (Kenton kit give MIDI in but not out), unison, caps/trimmers/chips (for reliability and stability - not features).
What others have you seen or thought of?
Variable detune for Ch II with full octave range. Detune lever now only has very small range and feet switches only allow a few choices. What is you want minor 3rd?
MIDI out. Take advantage of keyboard with poly aftertouch.
More presets. PIC/Arduino/RaspberryPI board with ADC/DAC to scan panel controls and save/restore like Prophet 5/Obie-X.
At waveforms. Sub-octaves?
Sub-Osc / PWM Osc per voice? Much thicker sounds with independent LFOs.
Put on your wishing caps!
David