SooperLooper is free looping software. Lots of great features and it can integrate with nearly anything.
I set up SooperLooper, Mainstage and the mighty Max/Msp for a live performance environment. Substitute Mainstage with the AU host of your choice. This example is for MAC/Linux, but you could probably do the same thing with a program called Mobius for windows.
MainStage and SooperLooper make a nice pair, and it’s much easier to control 4 Loops in SooperLooper than 4 banks of LoopBack. Give it a try – you might just like it.