Could a wah be modded to cut the frequency?

[Chris Goodson]

I though this could possibly be a useful option for people who use them as parametric eq's.  Anybody try this?  I know somebody on here has, it's way to obvious of an idea...

[puretube]

basic principle: put a bandpassfilter (=Wah) into a feedback-loop,
and the whole thing will act as a bandstopfilter, aka notchfilter...

[Chris Goodson]

So, how do I do that?

[R.G.]

Have you read...

http://geofex.com/Article_Folders/EQs/paramet.htm

and

http://geofex.com/Article_Folders/wahpedl/wahped.htm

at GEO???