The FS-10 is a multi-function foot controller that allows access to all 128 patches plus the tuner function. It operates in three modes: Patch Mode ‚ This mode allows you to switch between the three banks of four patches accessible on the front panel of the amp (patches 1-12) in addition to patches 13-128. Effects mode This offers individual switching of the effects within a patch, operating more like traditional effects pedals. Navigation mode Enables access to the complete set of 128 patches stored on the amp. These can be stepped through one at a time, or in banks.