Isn't there a mod plugin for winamp?
You could set the output to a directory, setup a playlist and leave it go...
(That's assuming the mod plugin for winamp is any good.. =)

Jazz
(List 112, S/N 00030, 4 gig blue)
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Jazz (List 112, Mk2 42 gig #40. Mk1 4 gig #30. Mk3 1.6 16v)