I thought the nature of an mp3 disc was to hold mp3s.
Lots of times, I've had a collection of mp3s that segue.
Anyway, the new problem is that apparently, with 17,
it won't accept an mp3 of any kind in order to create
a CD disc (you could do this in Toast 10). ...and, again,
if you try to line up a bunch of mp3s for an "mp3 Disc"
there's no way to create segues.