Wepa!
Wepa! plays back a sample, pitched based on which key you play. Holding a key loops sample playback. There's delay too!
Change the .wav file in the patch folder to play your own sample.
Knob1: Playback Speed
Knob2: Loop Length
Knob3: Delay Time
Knob4: Delay Feedback
Aux and Foot Switch: Playback Speed Shift