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====== Reaper: Tempo Mapping ======

Snap to grid is Alt + S - you will need this often.

===== Setup =====

  - Project Settings (🛈 in toolbar or Alt + Enter).
  - [Project Settings] Timebase for items/envelopes/markers: Time
  - For each MIDI item (if any):
    - Right click > Source properties...
    - [MIDI item properties] Ignore project tempo: checked
  - If there are multiple items, group them so the all move together.
  - Make sure the audio starts after bar 2.
  - View > Tempo envelope
  - Turn on Grid & Snap.
  - [Snap/Grid Settings] Show grid, line spacing: checked, 1, 1/2 or 1/4, depending on how accurate you want it.

===== Rough Match =====

  - Find a section with 2 or 3 bars with good transients.
  - Snap off, move the item so that the first transient aligns with any beat.
  - Snap on, create a selection starting at the first transient.
  - Snap off, adjust the end of the selection to beginning of a bar. Make sure you cover 2 or 3 bars and all the beats in them.
  - Menu > Insert > Measure from time selection (new time signature)...
  - [Edit Time Signature] Set bars, OK.
  - This will create a tempo marker with the correct tempo. Double click it and copy the tempo.
  - Double click the **very first** tempo marker and set its tempo. The media item will move.
  - Alt + click to remove the other two tempo markers.
  - Realign the media item. Make sure aligns with a bar and has the lead in bar as you want it.

===== Fine Tune =====

  - Shift + click on bar line in Tempo envelope to create marker.
    - Ctrl + drag on tempo at top of marker and move it to beginning of transient.
  - Adjust one marker without affecting everything to the right:
    - Ctrl + Alt + drag on tempo at top of marker.

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