I am working mostly reading or thinking on this project since several years.
The final instrument should have the following specs:
8 voice polyphonic
2 VCOs, 1 Multimode Filter, 5 EG, 5 LFO per VoiceFor all voices (Master section)
2 LFO, 2 EG, 1 RM , 1 Fixed Filter bank
I start with building a MIDI only instrument.
The envelope generators (EG) and the LFOs should be digital controlled/ implemented in a µC or FPGA
Here some videos of my Youtube channel
I implemented my first Envelope Genertator. You find more details at the following Link
The test shows a key down with an retrigger in the release phase (time013) followed by a complete run (finished at030) then you see a aborted attack phase (time035).