Arm SHIFT (double tap to arm)
Dont know if the shift button has a backlight? If it does, double tap to arm shift and turn on the light, and double tap to unarm and turn the light off.
In song mode I use much more often instant mute, in track mode I prefer to enter sound edit via the direct access via pads (UI had to change a bit to allow selecting another param while shift is armed). The shift button will be the first to wear out I fear.