The Logic Off Topic list

>The polymoog had a custom-made chip per key.  Each chip contained
>(more or less probably) an entire monophonic synthesizer.  That's the
>only way they were able to build polyphonic synths at the time.

Not quite. The Polymoog used  two master oscillators routed through
divide-down chips, like electronic organs, string synths, and a few early
Korg poly synths. This is why it sounded so thin and crappy. So it did not
have a complete mono synth on each key -- but it did have a filter and amp
for each key... of course, the filter here is not the famed Moog filter
either. It did have the advantage of being 71-note polyphonic though.

The Polymoog was a costly failure for Moog. It suffered numerous production
delays and was a major disappointment in terms of sound (although Klaus
Schulze and Gary Numan were among the few who could put it to good use). The
Polymoog was quickly forgotten when real polyphonic synths like the Prophet
5 came along.