Electro-Harmonix 22500 Dual Stereo Looper Dual Stereo Loops with either independent or locked loop lengths. Quantize or non-quantize (free running) modes. 16 built-in drum loops Mic input with Phantom Power. Programmable third footswitch for Stop or Tap Tempo. Sequential looping mode enables verse/ chorus switching. Parallel looping mode allows simultaneous playback of two loops Reverse and Octave functions. Undo-Redo your last overdub or recording Backup/restore to PC or Mac via USB port