[sdiy] ps3100 on ebay

[JH.]

> The 3100 is almost the only classic synth I've never had a go on. I'm
still
> not quite sure what the architecture is. I'm guessing there's only one
filter?

On the contrary. It has 48 filters that are similar to the MS-20 LPF,
with the exception that the range for resonance is much smaller. (That's
because they used a single diode as "VCA" to set the resonance level,
which only allows a certain amount of variation and tarcking between
voices.)

In addition to that, there's the resonator section with 3 VC BPFs - these
are used to process all 48 voices at once.

JH.