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Loops have to be the same length
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The number of files you add is defined by the number of loops you will hear, and the number of crossfader divisions.
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The number of files you export is defined by the number of loops divisions, or sample locks.
1 bar, 1 plock per step = 16 exports.
1 bar, 1 plock for 2 steps (1/8th) = 8 exports.
For zero crossings, you can try implemented fade in/out, or prepare audio files with your DAW, or Octatrack…