The way I see it, Fran... You shouldn't use the MP3-player in the E-80 at gigs. It's too slow to switch to (or back), no cue.
If you need an MP3-player, connect an iPod to the aux-in of the E-80, (I use my iPhone LOL), use its playlists etc.
The MP3-player in the E-80 is nice. A bonus. No "core-functionality", to my mind anyway. I use it for fun, to study new songs, but nothing more.
I wasn't surprised you changed your mind. In fact, I would say it's downright nuts to dismiss such a fine piece of musical instrument just because you don't like its.... jukebox LOL
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http://www.keyboardforum.nlHappy owner of a Roland E-80 V2