[sdiy] help finding roland filter schematics?

Oakley Sound oakleylist at btinternet.com
Wed May 6 16:18:09 CEST 2009

I believe it was the SH-2000 that sparked the transistor ladder patent 
issue. Early editions of the SH-2000 have the Moog ladder filter, while 
later ones had a five stage diode ladder [made with BE junctions of 

Since the VCF is contained on a separate circuit board it was an easy 
enough change to implement.



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