The titan of angels

Dude, your a jerk. I know what the Boss dd-20 is, I want to know other pedals that produse the same effect with less money spent on the pedal.

Hey, I'm looking at purchasing a guitar pedal, since my friend came over, and played on his Boss dd-20. I like how he can record something he just played, and then play a new guitar part, while what he recorded is looping. Does anybody know another pedal that can do this, but is cheaper? Or, the name of this effect would be appreciated. Thanks.