MG20 is the floor guitar processor with the lot! It has a 32bit float point DSP for better sound and True Simulation of Analog Circuits (TSAC) technology to give great modeling with your choice of 60 amplifier models. It has built in looping (up to a massive 60 seconds) , a sample-based drum machine and MP3/WAV player, sophisticated user interface and big colorful LCD display. MG20 is the pro solution for guitarist who wants great tone and function. The multi-purpose control pedal allows you to switch effects on and off, boost volume for a solo, TAP the delay time and modulation speed, or play/stop your backing track (MP3)! With an extensional pedal and the built-in Expression pedal, you are going to have superb control on stage! Lots of possibilities! With the USB port, you are able to update the system and edit tone on your computer! These include their own power supply.