This may be a no-brainer, but isn't the MP3 player supposed to go to the background (but keep playing) if you want to do other things? I've only used it for the jailbreak and a quick test so far, and don't have the device around so can't try it currently.
But I vaguely remember the description saying something like "Listen to music while you are reading", which would imply background operation. I may very well be wrong, though.
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