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The count-in always clicked exactly four beats, so a 3/4 song was counted in 4/4, and a song opening with a pickup (anacrusis) had the pickup enter where the downbeat belonged — putting the player a beat ahead all song. Bar length now comes from the song_timeline beats already on the highway (measure >= 0 marks downbeats), so no new plumbing: the time_signatures map is streamed to plugins rather than stored in the frontend. A first bar shorter than that meter shortens the count by its length — a 1-beat pickup in 4/4 counts "1 2 3" and the music enters on 4. Bar length is the mode of the downbeat gaps, not the first gap, so a pickup's own short gap can't be read as the meter; the beats trailing the last downbeat count as a candidate too, or a song of pickup + one bar offers only the pickup's gap. Pickup shortening is scoped to the song's first bar — a short bar elsewhere is a meter change, and is counted by its own length instead. Songs without beats (pre-chart, minigames, synthetic highways) still get four. Applies to both count-in paths: loop wrap / section practice, and the start-of-song 'Countdown before song' setting. Signed-off-by: gionnibgud <gionnibgud@gmail.com> Co-authored-by: Claude Fable 5 <noreply@anthropic.com>