Compensating multi-stage feedback (was: RE: all tranny vca+ )

[René Schmitz]

At 21:05 30.06.00 -0700, tomg wrote:
>
>So ...you are saying that only 75% of your audio path is in a negative
>feedback  loop...ok....
>
>> >100% agreed. I'd even go one step further: The complete audio path can be
>> >done without negative feedback. (And hence no compensation.)
>>
>> That's what I intended to say. Been there, done that - the audio path of
>my
>> JH-4 synth is completely built that way. The only multi stage feedback
>loop
>> is in the VCFs, to get resonance.
>>
>> JH.

To make the filter oscillate you need positive feedback!!
IMO this doesn't count as the purpose isn't to improve a gain stage. 
And quite tricky to compensate. *grin*

Bye,
 René

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uzs159 at uni-bonn.de
http://www.uni-bonn.de/~uzs159