I’m almost done with the PCB design of the Kosmo Teensy Module (shameless advertisement 
). The Teensy 4.1 is easily capable of running 4 polyphonic (with separate filters etc.) voices and more. You may want to combine this with some analogue modules for more interesting sounds, but it should be able to handle what you want. In fact, it might be an interesting project to have an open source CS-80 emulator for the Teensy available!
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