On Sun, 13 Oct 2013 10:04:59 -0700, bob wrote
(in article ):
Is there a filter that automatically adjust to the frequency change and
remove the feedback?
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Not quite automatically, but you can get some pretty good results with the
new iZotope RX3 standalone:
http://www.izotope.com/products/audio/rx/index.asp?hs13
Find the worst instances of feedback, let iZotope analyze it, and then you
can have it build some notch filters to knock it out as much as possible. My
experience is that you can generally remove at least 50% of problems like
this, then solve the rest just through careful level adjustment and EQ.
It's never perfect, but it'll be an improvement.
--MFW