[sdiy] Polymoog

[Tony Clark]

> Bear with me guys, I'm trying to have fun with this :) How complicated is
> the Korg PS series? Any velocity sensing there?

   Nope, afraid not.  The keys are nothing but a shorting buss, each tied 
to it's own oscillator circuitry.  The only real pain about the PS series 
is that there's no easy way to work on the boards in circuit unless you 
have a way to pull the connectors to the outside.  Either two expansion 
cards with 22-pin connectors or ribbon cables with the same.
   The cards themselves are pretty well thought out.  There are two 
oscillator cards which handle 6 notes in the octave each (the cards are 
identical, it's just a matter of tuning them to the right range).  There 
are 4 cards with the EG's, filters, and VCA's, then there are the 
assundry boards with the triple-resonant filter, ensemble, modulation 
circuitry, etc.
   Take a look at my PS-3100 page to see what it looks like inside:

   http://aupe.phys.andrews.edu/~clark/emusic/korg/ps3100.html

   Cheers,

   Tony

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