Archive of the former Yahoo!Groups mailing list: Discussion about the Korg PolySix synthesizer

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Subject: Compressor/Expander Circuit?

From: "chipaudette" <chipaudette@yahoo.com>
Date: 2013-02-25

Hi Folks,

Based on a previous post regarding frequency response of the synth's output, Johannes suggested that I check out the "compressor/expander" circuit on the KLM-368 effects board. I totally agree that the circuit has an interesting effect on the sound of the synth. I was hoping to figure out how it worked so I could better understand its purpose.

Below I show a schematic of this circuit along with some annotation and discussion of the individual elements:

http://synthhacker.blogspot.com/2013/02/mystery-circuit-polysix-post-effects-vca.html

Am I getting it right? What is this thing actually doing? Is it just a noise gate?

I'd love your thoughts.

Chip