Unknown 64 pro is a one oscillator synth.
With 4 waveforms triangle/pulse/saw and noise.
A filter envelope with 3 filter types. lowpass/bandpass and hipass. A pitch envelope /pulsewitdh envelope and volume envelope. Every Envelope can be inverted and has 13 different curves. A ringmodulation oscillator or a ringmodulation BPM LFO. A BPM LFO for the Pulsewidth/cutoff/and oscillator pitch. 3 big sequencers for creating the real c64 arps and percusions. One is used for the octave and notes, one only for octaves, one for the waveforms. All 3 sequencers are BPM sync with speeds from 1/16 to 1/128. They can be ended at every step or looped, also a vibrao/bitcrusher/midilearn and panner. Envelope restart/pickup and ofcouse 128 presets !!!!!