you might also want to check out the Looperlative -
www.looperlative.com - you have the option to record 8 separate stereo tracks, which can be synced to eachother, multiples of eachother or completely independent. And when the software is upgraded, it will eventually be able to have any of those 8 routed to the three stereo outs, which you could send to separate amps, or to separate ins on your recording device.