AW: AW: More on moog filter band pass mode.

[Haible Juergen]

	> I'snt the SEM a odinary ca3080 multimode filter?

Yes. I should have written "from the standard SVF" to be more
precise.

	>You are right, there is nothing like a HPfilter here i was to fast
to
	>type,
	>it seems to mee thet it are more like a (as you said)phase
inversion of
	>the 1 or 2 pole stage
	>(depends vere you take the signal out) and that makes the strange
BP
	>response.

To tell the truth, my OB-8 mod that makes the additional filter modes
available from the internal filter does not produce a perfect HP response,
either There is an  - ever so slight - additional rolloff at higher
frequencies
in addition to the dominant HP response. I guess it's due to some 
imperfections of the CEM3320 reconfigured as SVF. (They use one
gm cell, variable gm still active, to build the summing opamp, after
all !)
I love strange filter response when it's "musical" !

(This wasn't exactly a reply to your last paragraph, but I thought it
might be interesting nevertheless.)

JH.