The A-16CS Control Surface is an optional remote controller for the rack mounted A-16R Personal Mixer. The A-16CS plugs into an accessory port on the rear panel of the A-16R. Control information from the A-16CS is used to save and recall Presets, and adjust the Channel settings for level and pan, Group, Solo, and Mute in the rack mounted A-16R. It uses the same familiar button layout as the A-16II Personal Mixer. The A-16CS accepts a standard dual footswitch which can be used to step through the sixteen saved Preset mixes.