Doepfer

--- In Doepfer_a100@y..., Florian Anwander <
Florian.Anwander@c...> wrote:
> 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

That was going to be my next question, whether the A-123 has 
the same characteristics. 

I'd be interested to know more about that modification to the A-
121 though.

Thanks to all for the extensive information.

M. Dimm.