Tempo Library & record analysis
The Tempo Library stores a tempo record for each song in your crate — artist, track name, BPM, and the platter speed it was captured at. The music stays on your vinyl; the app only remembers the tempo. Recall a saved record and Follow locks to it instantly, no tapping.
Opening the library
Long-press the platter centre (the label/spindle area) on the deck you want to load. The Tempo Library overlay opens for that deck. Only the X button (or Escape) closes it — stray taps outside the panel are ignored on purpose.
Recalling a tempo
Tap a row and the overlay closes with that tempo locked into Follow for the trigger deck:
- If the metronome is already running, it re-locks at the saved tempo immediately.
- If it's off, long-press TAP to arm the metronome, then tap once on the record's "1" — the click starts right there at the saved tempo, dropped in on the one with zero taps of counting.
The recalled tempo is adjusted for your current platter speed (33 vs 45) and then rides your pitch fader — push the fader and the grid moves with the record, exactly as it should.
Turning the metronome off ejects any recalled tempo records — recall again next time you engage it.
Saving and managing records
- "SAVE CURRENT" stores the live Follow tempo as a new record — it prompts for Artist and Track Name. Start Follow first (the button tells you if there's nothing to save).
- Each row shows the BPM, and for analyzed records a "STRAIGHT" or "WARPED" verdict for the song's tempo feel.
- Row chips: "GRID" reopens the grid editor, "EDIT" renames the record or fixes its captured platter speed and feel, the 33/45 chip shows the capture speed, and the red X deletes.
Why the capture speed matters: recall scales the saved tempo by your play speed versus the capture speed. A record captured while the app thought the platter was on 33 — when it was really on 45 — recalls at the wrong BPM until you correct it with "EDIT".
Analyze a record: the tempo map
"+ ANALYZE NEW RECORD" (top of the library) captures a song from the deck and builds a full beat grid for it — beat-accurate loops and readouts across the whole song, even if the drummer drifts.
1. Capture
- Set the pitch fader to zero — the view guards this ("PITCH 0% OK") so the stored tempo is the record's natural one.
- Press "START", then drop the record in on the 1.
- Let it run (30–60 seconds of a steady section is plenty; a whole song is fine too), then press "STOP".
"RELOAD LAST CAPTURE" brings back your previous capture if you closed the view or want another pass at the grid.
2. Review and grid
The capture appears as a waveform with detected beat ticks, a suggested "1", and a tempo curve lane underneath. The lane walks you through the flow:
- Mark the "1" — click exactly on the first downbeat, then on the last bar's downbeat (right-click drops a mark at the playhead). Zoom with the +/− buttons to get it sample-tight.
- Set the tempo — tap along on the tap cell or type a rough BPM. Close is good enough; it's only a hint.
- Press "MAP BARS" — the exact grid lays across the whole song, anchored on your marks. Your marks fix the endpoints; the math and the audio settle the bars in between.
- Check by ear — "|<" plays from the "1", or tap anywhere on the waveform to audition from that point. The tempo curve lane shows the per-bar BPM, so a warped song is visible at a glance.
3. Fix, then save
- "EDIT BARS" lets you drag individual bar lines to warp the grid where the song actually drifts. "UNDO" steps back; "CLEAR ALL" starts the review over; "RE-MAP" re-lays the grid after changes.
- "TRUNCATE" crops the capture (and grid) to the section you marked.
- "SAVE GRID" writes the record — artist, track, BPM, capture speed, and the full grid — into the Tempo Library.
From then on that song recalls with its complete tempo map: straight songs get a straight grid, warped ones follow their own curve.