"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?
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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