I must confess, I have not used Ableton Beat Repeat plug-in that much (even if it has been around since the 5.0 days)
But I did a test tonight, had two house tracks playing, same key, and had one or two bar loops happening with both tracks, and move the loop bars around. Meanwhile, I had beat repeat slicing and dicing one of the audio tracks into new variations. The result was pretty interesting, like a freshly made groove-loop every time.
This is a little bit how the Spectrasonics RMS Stylus is doing with drum tracks. But I could take any DJ tracks and let Beat Repeat make new versions of small loops over and over again, annotating other tracks. So it could build up totally, unexpected new mixes, live. If the loops also have melodies, the beat repeat changes would make it all very interesting!
Which leads to another topic. I do feel that a DJ should be proactive, do unexpected things, even if it could lead to problems on stage from time to time. It’s very boring to be part of a totally prepared show, with everything done in a secure way to avoid mistakes. For me that’s more boring than a train wreck from time to time, but the DJ is really trying to push it and make the event an experience for everyone.
Maybe you have seen this movie before, but here Robert Henke is presenting beat repeat plugin.