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A full list of features that you are able to map to a Switch-3 or Switch-6 device can be found below:

► STEP
► PITCH COR(rection)
(Global in SETUP, not HardTune)
► ALL MUTE
► µMod
► Delay
► Reverb
► Voc(al) HIT
► Double
► Harmony
► Transducer
► HardTune
► Rhythmic
► Stutter
► Choir
► Synth
► Harm(ony) Hold*
► Set Key
► Tap Tempo
► Bypass
► G µMod (G = Guitar)
► G Delay
► G Reverb
► G HIT
► G Comp(ressor)
► G Drive
► G Amp
► G Rhythm
► G Octaver
► G Wah
► G Mute
► ALL HIT
► Go Looper (enter looper Layer)
► Loop Input
► Tuner
► 1But(ton)Looper
► LPlayRec (Looper Play Record Overdub)
► LStopErase (Loop Stop Erase)
► Loop Undo
► L(oop) Erase All
► Loop Trigger A-H
► Track Start
► Track Stop
► Track Forward
► Track Backward
► Seq Rec (Sequence Recording)
► Seq Undo (Sequence Recording Undo)

Although it is not possible to map the Talk/Tuner feature to the footswitch, you can use the Bypass option which will mute all effects.