Pow Pow's Polybeats Hack....Please Help

Fellow wizards of PD, I’m trying to change the Pow Pow’s Polybeats program so i can play recorded loops (samples are 1 or 2 bars long) one after the other, so when I press C plays the loop and then when i play D other loop starts and the loop before ends. I’m trying to dig in the program but my knowledge of PD is pre padawan level, I understand some parts but I’m getting lost.

Does anybody has done this before?