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From SpacialAudio

The Gap killer is used to remove near silence from the beginning and end of tracks. This ensures that there is no "gap" between tracks, and also helps in making cross-fades sound better. This can be found in SAM Broadcaster and SAM Party DJ.

Basic Configuration

To turn on the gap killer, make sure the Enable gap killer checkbox is selected.

• Remove silence from beginning of track: If this is checked the gap killer will remove any sound below the Trigger level (specified in dB) from the beginning of the song, where 0dB is very loud and -100db is almost silence. The default setting of -24dB can be classified as "quiet" and is the recommended setting.

• Remove silence from end of track: If this is checked the gap killer will remove any sound below the Trigger level from the end of the track.

• Detect and ignore spikes and blips: This will ignore scratches, blips and errors in the audio that might cause the gap killer to mistakenly allow silence because it detected sound above specified trigger levels.

• Trigger end of song if more than [xx] seconds of silence: if either the beginning or middle of a song contains a period of "near" silence as specified in the dB values, the end of the song will be triggered if this period of silence exceeds the above specified time. Great for getting rid of "hidden tracks", but bad for songs recorded or encoded at very low volume levels, or tracks with long periods of very low volume audio. Such songs may be prematurely ended, or even be totally skipped.
  • Note: For tracks like these it is luckily possible to disable to gap killer in the song settings for the track.