The click as it is played, for useLivePerformance.setTempo({ click })
Clicks before the first beat
Length of the count-in
When the first beat after the count-in falls
How much later than scheduled the clicks are heard: the audio output's
latency as the browser reports it, 0 when it does not. Pass it to
useLivePerformance.setTempo as heardLateMs, so a performer playing to
what they hear is judged against the beat as they hear it.
When the first count-in click sounds
When a started metronome's beats fall, on the
performance.now()clock.