Oh, good point about mp3-only. However, FLAC is not Vorbis. FLAC is Ogg now.

I don't want to second-guess you or anything, but running FLAC on the empeg isn't ideal. It'll keep your hard drive spun up a lot. If I were you, I'd also transcode the FLACs to mp3 (or Vorbis, if you like) for use on the empeg (and other portable devices).