OptionalhasWhether the composition already has clips (enables "play along" option)
OptionalonClose/dismiss the recorder panel
OptionalonOptionalonTrigger play-all on existing clips. The recorder passes a
scheduledStart (a performance.now() value) when starting a new
recording with "Play along" enabled so the encoder begins at the
same wall-clock as the existing clips' playback — keeps the new
recording aligned with t=0 of the master timeline.
OptionalonTrigger stop-all on existing clips
Props for ClipRecorder.