Search for external SD2 card. You should have a different TAB for each memory card feed to the tablet. SD1 it's usually the internal one, SD2 it's the USB stick.
On the other hand, a short touch on the media file should pop up a window asking to play the file by selecting a player.
In BSPlayer's options set MP3 as an assciated extension. Search android forum about how to do that.
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