Line 6 MM4 Modulation Modeler 4 completely programmable presets available at the tap of a toe. No more need for multiple pedals for multiple effects. True Bypass switching, so your direct tone is exactly that; direct from your guitar to your amp. Expression Pedal Input - for real time control of all effect settings. Also the ability to morph between settings lets you create effects not possible with the originals. Stereo inputs and output Runs from batteries or optional power adapter. 4 completely programmable presets available at the tap of a toe. No more need for multiple pedals for multiple effects. True Bypass switching, so your direct tone is exactly that; direct from your guitar to your amp. Stereo inputs and output Runs from batteries or optional power adapter. Also the ability to morph between settings lets you create effects not possible with the originals. Expression Pedal Input - for real time control of all effect settings.