Megaloop is a Max for Live MIDI effect made for mashing up clips in Live's Session View. It features 8 different sequences each with their own set of parameters, as well as clip gain and transposition control for each targeted clip. It's really fun to use and you can get amazing results.
You can use multiple instances to control up to 8 clips in separate targeted tracks. It's highly recommended to load each target clip into RAM. Especially if you intent to use the legato mode for true loop comping. Also make sure to set the clip quantization as low as possible.
Watch the Demo Video:
This way for heaps more Max for Live devices & tips.