Doepfer

Hi Tim

There is a modification that gives a much better highpass behaviour at low
cutoff frequencies to the A-121. I don't know whether it is documented in
the service manual. But this may cause a uncontrolled and unwanted self
oscillation in high cutoff frequencies.

> I don't have an A-123 high pass module, but I
> note that it uses the same CEM 3320 chip - it would be interesting to
> hear from other list members whether it behaves in a similar fashion.
No. As far I understood the problem appears only in the state-variable
circuit. And the 123 is a pute pure hipass filter.

Florian
-- 
Florian Anwander                  |ConSol*  HP-Support
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