its so simple its ridiculious :) with this technique you can have two samples/loops sitting on one part/channel. Gives your esx a new dimension doesnt it? Btw. this trick can also be accomplished on the ESX by just pressing shift-record (resample) and hitting two partbuttons (the 2nd should have reversed toggled on).
some free samples from the awesome German producer ghosthack. 320kbps (good enough to sample). http://www.ghosthack.de/remository/dubstep-samples/