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i know the ipod has an optional wired remote/headphone jack, im sure it would work with the iphone or itouch and shuffle as well. im sure the zune has an accessory, as well as many other like mp3 players...
even the psp has something that you can control volume and track from a headphone/remote adapter as stated above. i picked one up at ebgames when i got my first psp :)
jd
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