In this video Paul Gilbert is demonstrating Ditto X2 Looper from TC Electronic.
Paul shows how to make creative use of the half tempo feature as well as the reverse effect.
Ditto X2 Looper product page: http://www.tcelectronic.com/ditto-x2-looper/
StarJam Loops:http://www.tcelectronic.com/starjam-loops/
-Where you can download loops that you can load into the Ditto X2 Looper.