Smoothing applies a median filter to both lines (and the score), removing one- and two-frame glitches; longer windows start flattening vibrato. Your pitch is drawn at its true octave. The score counts a frame as on pitch when you're within 50 cents of the recorded note in any octave, out of all frames where the recording has a sung note. If your line runs consistently early or late against the gold line, nudge Mic timing. Keys: Space play/pause, ←/→ 5 s.