via this auction
"This Poly 800 has the reversed keys, plus the following modifications:
Potentiometer for filter cutoff frequency
Potentiometer for filter resonance amount
Filter slope switch (12 or 24 dB / octave)
Switch to toggle FM on/off
Potentiometer for FM amount
These additions extend the synth's range to far beyond a normal Poly 800 (although it can be used without the mods by turning cutoff to max, resonance to min, selecting 24 dB / octave and switching 'FM' to off). The FM can add harmonic overtones, or extreme distortion at higher amounts. Care should be taken with the resonance amount as, after about 75%, 'feedback' can occur quite suddenly (and loudly). Therefore, running the instrument through a compressor is recommended."
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