Multi-percussion and looper pedal QUANTUM LOOP solid mahogany case 16 sampled percussion sounds selectable (2 banks of 8) 4 custom sound slots (via USB and free Mac / PC software) looper with unlimited number of overdubs (separate volume loop length up to 5 minutes) comfortable and ergonomic velocity sensitive (switchable by switch) 6.35 input and output jack volume external trigger input Quantum Exp removable rubber surface for heel power supply via 9V AC adapter (supplied).