I use the sync button quite often, as well as intros, endings, fills, breaks, repeating loops, etc., all in the same song. It adds imagination. I look like a button pushing addict in some songs, as the PA800 allows for incredible arrangements. And as Diki pointed out, precision is the key.
[This message has been edited by zuki (edited 05-18-2010).]
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Live: Korg PA4X/Bose L1 Pro 8/Senn 935
Studio: Korg PA4X/Kawai MP7SE/Tascam DP24SD/Sony C80/AGK 214/ATEM Mini Pro switcher/