Replace audio
Replace audio swaps the audio file of a song while keeping all its markers, cues, and triggers intact. If you receive a corrected audio file the morning of a show, you can swap it in without rebuilding your cue structure.
How to replace a file
Right-click a song card and choose Replace Audio. A file picker opens. Select the new audio file. LTCast then compares the waveforms of the old and new files and calculates the offset between them before showing the alignment preview.
Alignment preview
Before applying the replacement, LTCast shows a dialog with:
- Old duration β the length of the file being replaced
- New duration β the length of the incoming file
- Calculated offset β how much LTCast will shift your markers to keep them aligned to the same moments in the audio
- Markers affected β the count of markers that will move
Review the values before clicking Apply Replacement.
Low-confidence warning
If the waveforms of the old and new files do not match well β for example, if the files are from very different sources or have very different content β LTCast shows a low-confidence warning in the preview. You can still apply the replacement, but manually verify that the markers landed in the right positions afterward.
Clamped markers
If the new file is shorter than the old one, some markers may fall past the end of the new file after shifting. LTCast clamps those markers to the file end and shows them highlighted in the preview. After applying, review and reposition any clamped markers.
Applying the replacement
Click Apply Replacement in the preview dialog. LTCast:
- Updates the song to reference the new file
- Shifts all markers by the calculated offset
- Queues the new file for an LTC rescan in the background
The song card updates immediately to reflect the new file name and duration. The old file is not deleted from disk.
Undo
Replace audio is undoable. Press Ctrl+Z (or Cmd+Z on macOS) to revert to the previous file and restore the original marker positions.