Rick,
Try
DSP Filter
BY
JE3HHT - Makoto Mori
DSP filter for Win95/98/ME/NT/2000 and Soundcard

FREE from
http://mmhamsoft.amateur-radio.ca/index.htm

73, Ace www.WH2T.com
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"Rick" wrote in message
news

I'm looking for an audio DSP program that runs on a (fast) PC and provides
some of the audio DSP features that something like the MFJ 784B provides.

One would take the audio output from a receiver and feed it in the "line
in" port and get DSP'd and filtered audio output from the computer
speakers.

Anything like that available?