This is a synth I've been wanting to demo for a long time and it didn't disappoint. The Korg Mono/Poly was released in 1981 and is the somewhat quirky sibling of the Polysix. It's essentially a 4 oscillator monosynth with different waves, footings and volumes available on each oscillator. There's two independent LFOs, two envelopes, cross mod, oscillator sync, a 4-pole low pass filter that can self oscillate, pwm, detune, portamento, an arpeggiator, CV/trigger in and out and a couple of assignable wheels. However...things then get very interesting in the "key assign mode" as this is where the "Mono" and "Poly" parts of the Mono/Poly are found. You can play monophonically with just one oscillator triggered or you can select 'unison' and have all four oscillators triggered simultaneously. Combined with whatever waves and footings you've selected on each oscillator this can get interesting.