DigiTech HARDWIRE TR-7 Owner's Manual page 19

3. Tap the Foot Switch at least two times to set a new modulation speed.
The last two pedal tap intervals set the modulation speed. If a tap
hasn't been initiated after 4 seconds, two taps will be required again to
set the tempo.
4.
To exit Tap Tempo, press and hold the Foot Switch for 3 seconds until
the Indicator LED stops flashing and lights solid BLUE again. Once Tap
Tempo mode is exited, the tapped modulation speed remains active
until either the Type is changed or the Speed knob is adjusted.
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