hold SCREEN+TEMPO
activate midi perimeters menu.
or hold SCREEN+(triple click TEMPO)
will hold that perimeters menu.
in midi perimeters you can remap and mute using standard method
hold SCREEN+(triple click TEMPO)release+use first knob
modulate input volume.
in my demo im holding shift, but after experimenting i have realized that i dont have to hold shift for this 
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