Twisted Tools hinted at their awesome new ULTRALOOP, loop remixing tool back in 2013 and today it is finally available! Check it:
"ULTRALOOP is a first-of-its-kind loop remixing sampler with a fast and intuitive visual workflow for Native Instruments Reaktor. ULTRALOOP combines advanced loop layering, comping, effect processing and automation techniques to generate new grooves, riffs and song ideas. You can use ULTRALOOP with the included factory sample library or to remix your own samples, injecting new life into any existing loop library. In addition to the factory library, Ultraloop Expansions are available as part of our Loop Expansion series."
Brent Kallmer Tutorial:
Chris Carter Expansion Pack: