Find out how many milliseconds of delay there is between the sound's play-start time, and when
you hear it.
Instructions
Tap the button on beat. The delay will be measured on a trailing average of the last 10 beats.
You'll have a countdown and timer until the starting beat.
[current latency] % [ms between beats]
. It's possible for
someone's hardware to have latency that extends beyond the duration of a whole beat, so
it's hard to know if a person just missed a beat, or if they really did click the moment
they heard the first beat.