[sdiy] ASM VCF Problem

[Frédéric Piron]

Hi list,

(Previous message didn't make it thru to the list so here it is 
again...)

Got a little problem with the VCF section of my ASM-1. Everything is 
working (filter sweeps, etc) but when I twiddle the cutoff pot I've got 
a big loud noise comming in. In fact it's only when the pot is in the 
positive domain. So from -15V to 0 the filter sweeps normally and as 
soon as it is from 0 to +15V I hear a terrible noise that replaces the 
sound of the vco.

Have tried changing the ic's and the trannies from the expo section 
with no luck. Re-checked my work but still bogus.
I'm lost here...

Does anyone have experienced the same problem or has a clue on what's 
going on??

Any help appreciated,

Fred.