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Use a cable that combines the male L/R RCA audio plugs on the amp to a male 1/8" stereo mini that hooks into the computer. Radio Shack carries them:
[radioshack.com...]
You don't need a Monster cable (they're the cadillac brand of audio cable - it's the first one I found), but that's the type of cable you need. I think the Radio Shack house brand is like $4.