Trim voice track

Freshly recorded voice tracks can be trimmed at the start and optionally at the end in the Cue Point Editor – for example to remove a slip of the tongue or a pause before the actual message – and then saved back to the same location on the server. No database entry is created.

Requirements:
- The loaded file is a voice track (file name starting with "VT - ").
- Cue point 1 (fade-in) is set – it defines the new start.
- Cue point 10 (cue-out) is optional – if set it defines the new end, otherwise the file is trimmed up to its end.

The function is only available when these conditions are met.

Steps:
1. Load the voice track into the player and open the Cue Point Editor (Ctrl+T).
2. Set cue point 1 to the desired new start position (Shift+Enter); if needed set cue point 10 to the end position.
3. Start trimming: Ctrl+B or the "Trim VT" button in the waveform toolbar.
4. Confirm the safety prompt with Yes.

The voice track is re-encoded in its original format (MP3, OGG or WAV), uploaded to its previous path (the original file is overwritten) and then reloaded. All steps are accompanied by voice output.

Note: Voice tracks are not stored in the database. The tag, gain and database functions are therefore locked (see "Tag Editor" and "Cue Point Editor"). Setting cue points stays possible, as it is needed for the trim boundaries.
