This my attempt to emulate A Oberheim SEM 4 Voices Polysynth. I added 4 ADSR to control the VCFs and 4 VCOs to get 2 osc per voice. The fx section is optional but one can dream? I think this could be a very obese sounding synth. If somebody can find a cheaper alternative (all analogue) let me know. 4 more ADSR to control pitch and a Quad quantizer for the slew limiter to do like the glissendo of CS80