HEre's a raft of programs with many free or demo versions...
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http://www.dxzone.com/catalog/Software/DSP/In the future, you might want to consider adding a $.99 audio output transformer from Radio Shack. This will better match the low impedanc eoutput from the rig to the high impedance imput of the PC's soundcard. It will also isolate any stray RF from the PC.
73,
---* Ken