Th yamaha CS40... released about '78, it's got 2 oscillators, and can be played as two note poly (duo-phonic), an LFO, a VCF, and a VCA - but in 'Unison' mode you can stack all 4 voices (for a monophonic fatter sound if you like).... So it'll do 2 note poly, with sub osc' in normal mode,
Each VCO does sawtooth, square (pulse) & triangle wave & can be switched between 6 octave ranges and also has fine tuning... Then an OSC' mixer section adjusts levels between VCO1 and VCO2 in a regular style - The sub osc' does sine, up-ramp, down-ramp, square, and sample-&-hold and can modulate up into audio frequencies - each VCO has an simple Attack & Release EG.
There are two envelope generators, one for filter & amp which is a shared ADSR (Attack Decay Sustain Release) EG, and the simpler VCO EG as noted above.
The VCF is a multimode filter, and it switches from LoPass, BandPass, and HiPass, with a dedicated control for cutoff and resonance - You get a Pitch & Mod Wheel, and the Mod' Wheel can switched to select either VCO or VCF to modulate. Also the CS40M has separate CV & trigger outs for each voice and CV inputs for portamento, sustain, brilliance, volume and filter. - It also has high, low, and balanced outputs.
Never used this synth, but the CS30 was a big hit with 808 state a while back... dunno if they still use it - The CS's are cool well built robust units generaly, the filters are hard if you like, to my ears harder than korg filters giving them an aggressive edge if needed - comments please people if you use one.
Yamaha's M-Series brochure showing the range
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