Dolby-ize An mp3 track

in iPod + iTunes + AppleTV edited January 2014
Anybody know how I can pass a recorded concert mp3 through something that would reduce or remove the recording hiss? This is a concert from Bill Graham's collection recorded in 1975. It is great except for the audio tape hiss.

What's a good app to do this? Can GarageBand do it? Audio Hijack? I have both but never used them for this purpose.


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