Output Level. This has an obvious use.
Display.
Write Button. Used for when you want to commit changes to the memory.
Left and Right buttons. Mainly for skipping around the menus.
Patch Value Knob. Used for changing parameters inside the patches.
Exit Button. Obvious.
System Button. Control most sys aspects of the unit from here in to a menu.
Effects Button. Pretty obvious - a way to get to the effects section.
Modeling and Alternate Tuning Button. Press to get to the modeling or when used with other settings the custom tuning ability.
CTRL up or down. These change the current stored sound.
Expression Pedal. Obvious, but if you are not familiar with expression pedals you can 'attach' a parameter to the pedal and control it.
It also come with the guitar 13 pin attachment for any guitar