This foot pedal is almost a must have if you own the fender mustang IV/V amp. It allows you to quickly and easily change preset, and then turn on and off the pedals linked to it. That's pretty muck it. Mode 1 has your 3 easy acess prsets-each button selects one of them. Mode 2 allows wou to scroll through presets. Mode 3 links each button to a pedal type, and pushing them will turn the pedal on or off. The only way that i feel this product could be better for it's purpose is if it had a button for activating the reverb effects, as that can only be done through the amp.
Even thought this footswitch is for the Fender Mustang amps, I am using it for the MG-40 works well and if you are OCD Fender will send you a magnetic overlay. Works well and allows you to use the looper function of the amp. Sturdy and simple to use