Electro-Harmonix 22500 LOOPER Dual Stereo Looper PedalWith the Electro Harmonix 22500 Dual Stereo Looper pedal you can record, play back, and overdub two channels of 16 bit uncompressed audio at a 44. 1 kHz sampling rate; any loop can be stored in a bank on a removable SDHC card. Both looping channels have reverse and octave functions, undo redo capability for deleting or restoring your last recorded loop, a quantizing option for syncing your tracks, and LED indicators displaying looping and memory