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I think that the major power consumer of the Ax when playing mp3's is the cpu, not the screen. I could be wrong, I still turn of the screen myself but I think that someone did some tests a while back.
A late answer to someone elses question. I use WMA files at 64kbps, they're supposed to be just like 128kbps mp3 (they sound ok to me - this ain't exactly a hifi system). The best thing for me was that you can use WinAmp's WMA writer plugin to create them incredibly easily.
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