====== Reaper: Adjusting Recording Latency ======

Determine actual latency.

  - [Reaper] Preferences > Audio > Recording > User audio driver reported latency, uncheck.
  - [Reaper] Add track, record something.
  - [Interface] Connect headphones (?) into input.
  - [Reaper] Add track.
    - Turn off monitor.
    - Arm for recording.
    - Set input.
  - [Reaper] Play and set levels so track 1 & 2 roughly match.
  - [Reaper] Record.
  - [Reaper] Track 1: Put a marker (M) at a distinctive point.
  - [Reaper] Track 2: Put a marker (M) at the same point.
  - [Reaper] Double click in the ruler (top) in the space between the two markers (creates a time selection).
  - [Reaper] Right click in the ruler (top) in the space between the two markers > Samples.
  - [Reaper] Bottom, Selection: [from] [to] [number of samples].

Determine reported latency error.

  - [Reaper] Delete second marker.
  - [Reaper] Track 2: Delete item.
  - [Reaper] Preferences > Audio > Recording > User audio driver reported latency, check.
  - [Reaper] Record.
  - [Reaper] Track 2: Put a marker (M) at the same point.
  - [Reaper] Double click in the ruler (top) in the space between the two markers (creates a time selection).
  - [Reaper] Right click in the ruler (top) in the space between the two markers > Samples.
  - [Reaper] Bottom, Selection: [from] [to] [error number of samples].

Set correct latency.

  - [Reaper] Delete second marker.
  - [Reaper] Track 2: Delete item.
  - [Reaper] Preferences > Audio > Recording > User audio driver reported latency, check.
  - [Reaper] Preferences > Audio > Recording > Input manual offset, set samples to [error number of samples]

Check it.

  - [Reaper] Record.
  - [Reaper] Waveforms should match.

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