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Page 646 of the X2 manual, under "Algorithms and rendering" :
"Typical algorithm choices for an AudioSnap session work like this:
• Do your AudioSnap time stretching, error correction, etc., with a quick algorithm: choose either Percussion or GrooveClip.
• After your AudioSnap editing is finished, bounce to track with a better algorithm: choose one of the Radius choices, or for drum tracks, Percussion is usually the best choice."