How does a Tap switch control the Deco?
To use a Tap switch with the Deco, you must first set the pedal to TAP expression mode. You can find details on how to set the pedal in this mode here.
A Tap switch connected to the Deco’s EXP input will control the Lag Time knob on the pedal. The Tap tempo has a fixed 1/8 note subdivision, so tapping in 1/4 notes with an external tap switch will return 1/8 note repeats on the Deco.