Korg MS20 filters

[>>>marjan<<<]

Martin Czech wrote:
> 
> Yesterday I also wanted to have a closer look to the Korg MS20 filters
> (hyperreal). Oh dear, Korg-35 "modules" instead of a plain schematic.
> The really important parts of the filter are missing.
> Some special Korg IC?
> Now I looked into the archive, later models used LM13700,
> no sound change was observed, and could find this version:
> 
> http://www.mindspring.com/~vco/maxx2/page_015.html
> 
> Could some guru please confirm, that this (nice) cicuit is equal to the
> newer MS20 models?


The circuit with LM13700 is also at hyperreal: 
http://machines.hyperreal.org/manufacturers/Korg/MS-synths/schematics/KLM-307.GIF


marjan