yes, Mainstage doesn't have a timeline, but Mainstage will hold instruments with sequencers or arpeggiators, which rely on timing (by internal sync or external)
The Logic package's own Ultrabeat is a good example.
Even a simple tremolo effect will need this if it's supposed to run in sync with the music.
Unfortunately Mainstage will not sync to incoming midi clock nor send it out (perhaps the latter is posible ** plugue bidule, I don't know)
I've made some fuss over the former:
http://discussions.apple.com/thread.jspa?threadID=1809505&stqc=true
…because I think it degrades the potential of Mainstage.
Message was edited by: thalund