Vintage Simmons Drums (UK) Users Group

> There is just the noise filter chip (SSM2044) that we could replace 
> with OTAs(CA3080,LM13700)to emulate this VCF.

Be aware that the SSM2044 VCF doesn't sound anything like an OTA
filter.  The 2044 is a sort of folded ladder filter, with more in common
with a Moog filter.  (I can look up the patent number for the SSM if
you're interested).  The difference is clearly audible with sustained
notes, but may not be apparent with percussive noise.

> I am always working on drawing schematics from my own SDS9,my 
> SDS1000,

I have SDS9 and SDS1000 schematics, which I will scan when I've
finished the SDE manual (almost done).


Steve


-- 

Whatever you Wanadoo:
http://www.wanadoo.co.uk/time/

This email has been checked for most known viruses - find out more at: http://www.wanadoo.co.uk/help/id/7098.htm