A fun method is FOLLOW ACTIONS. In each audio or midi clip there is a little L button. Enable it and have a quick read in the help manual about launch options.
Essentially any clip can trigger another clip once its played for a specified number of bars, there are 2 "chance" operators that determine the likelyhood of either event happening. if you only use one chance operator then the event will always happen.
This is a great way to make many variations of say, a drum loop, with either randomness or pre-determined triggers. Add midi triggering with a controller and you are really cooking.
Say i have 5 loops all based on the same audio loop. One is reversed, one is filtered, one has a beat repeater etc etc
Change all 5 follow actions so that they have a chance of 1. Make sure the clips are a group (they are all together in the track, no gaps). Set a follow action of *any*. Play first clip..... Once each clip plays for one bar it randomly triggers *any* from that group.
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Hey presto, instant variations.
This is a VERY basic demo of the possibilities here. I personally use a Roland foot switch to trigger scenes whilst playing with a combination of different follow actions. This leaves your hands free to tweak the shizz.....
PS. Perhaps an interested moderator could start some stickies with APP Specific Help? I can help out with Ableton LIVE, maybe some other heads could help with Logic/Cubase/Pro Tools etc.