> OK, this DSPic thing is kind of a neat and creative idea, and DSP is
> something I am interested in, but haven't really had any time or real
> reason to look at. I have read about it and the things you can do with
> it. It's probably impractical for me to pursue this in reality, but it
> is interesting.

Have a look at a couple of recent issues of Circuit Cellar. There are two p=
rojects this year where a dsPic has been used to make an audio frequency an=
alyser, displaying on a LED bargraph. The most recent one is a stereo one. =
These should give you a feel for doing DSP on audio.

I had assistance from a guy to set up a sound system in a church which was =
almost a pentagon shape on the ground plan (the sides were not all equal le=
ngth) and this created all sorts of echo problems. He used a similar analys=
er made out of a number of analogue filters, with about 5 or 6 channels. We=
 fed a white noise source into the speaker system, and used a microphone at=
 the normal speaking position fed into the analyser. The frequency response=
 was then adjusted using the equaliser on the speaker system so that the di=
splayed frequency response was flat. It made a big difference to how much l=
evel you could before feedback, as it meant there wasn't a frequency with a=
 highish Q 'hump' in the response.
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