4 x function generators
3 modes:
   1. ad (attack – decay)
   2. ahr (attack – hold – release)
   3. cycle (ad envelope loops)

each function can have a linear or exponential curve.
wide time range for attack/decay controls: <0.5ms to well over 30s
All analog and discrete logic for function generation (totally smooth and continous waveforms)

12hp and skiff friendly