Quote:

why do I not want the last frame of one mp3 to end and the first frame of the next mp3 to begin, as opposed to even a slight crossfade?



Because the frames are fixed length (38th of a second), and might have some silence in them.

You either need to spot this (which is what gapless on the Karma does), or you need to crossfade a little, blurring the edges.
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-- roger