I think the Empeg would have to be on when uploading mp3s. Its not simply a case of shoving tunes onto a drive - the Empeg has to sort them out. (very technical!)

Even if it did work, I see no clear advantage from this setup. Or am I missing something? Do you just want a way to upload music without the Epeg being switched on? Not possible I don't think. Or are you thinking more of a file-taxi use?