[sdiy] Polymoog Polycom chip block diagram?

[Michael E Caloroso]

> That last point is really interesting. On most musical instruments,
repeatedly playing the same note does NOT generate a series of
identical-sounding notes, as it would on
> a synthesiser. I’ve never played a Polymoog…. How does this work in
practice? Is it convincing/useful?

As an owner of a Polymoog since 1985, the velocity sensing is effective at
repetitive playing - as long as you do not use the sustain pedal.  With the
sustain pedal engaged, repetitive playing of a single key increases the
volume with each repeated key press.  That was one of its faults.

They dropped the ball on the two pole VCF on the PolyCom IC in that the VCF
has zero resonance capability, zero modulation (no EG, no LFO, no key
tracking, no velocity), and its cutoff is varied by fixed resistors per
preset.  It is merely a "brightness" filter.

My Polymoog is one of the later ones that are more reliable.  But as I
acquired more analog polyphonics and other gear, the Polymoog saw less and
less use.  I almost never use it anymore with all this cool MIDI stuff.  It
still works but it is now the coffee table in my living room, as the music
room in my new house has limited space.

MC

On Thu, Feb 17, 2022 at 7:06 PM Adam (synthDIY) <synthdiy at adambaby.com>
wrote:

> http://till.com/articles/moog/patents.html
>
>
> Re the Polymoog:
> On that page it says..
>
> “The pitches come from top octave generator ICs and flip-flop dividers,
> and there is a custom 16-pin chip for each key that performs various
> envelope, modulation, waveform mixing and 2-pole ladder VCF duties.  The
> chip's envelope generator is sensitive to the key velocity and also to the
> length of time since the key was last played."
>
>
> That last point is really interesting. On most musical instruments,
> repeatedly playing the same note does NOT generate a series of
> identical-sounding notes, as it would on a synthesiser. I’ve never played a
> Polymoog…. How does this work in practice? Is it convincing/useful?
>
> A
>
>
>
>
>
>
>
>
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