DigiTech HARDWIRE TR-7 Owner's Manual page 20

Below is a table showing the ratio of tapped tempo and the speed at which the
effect should modulate.
Type
Tremolo
Opto Tremolo
Bias Tremolo
Duo Trem
Rotary
Ultravibe
VibroPan
14
Tap Rate
1 second
1 second
1 second
1 second
1 second
1 second
1 second
Modulation Rate
4 Hz (4 beats per second)
4 Hz (4 beats per second)
4 Hz (4 beats per second)
4 Hz (4 beats per second)
2 Hz (2 beats per second)
2 Hz (2 beats per second)
2 Hz (2 beats per second)