Effects Preferences allow customizing audio effects, applied to encoded audio. Volume adjusting, Fade-in, and Fade-out, Trimming of silence, and Limiting of duration can be managed in the Effects Preferences tab.
To open Effects Preferences tab, choose Converter > Preferences > Effects.
- Loudness (EBU R128) Normalization
- Peak Normalization
- Automatic Volume Control
- Fade-in / Fade-out
- Trim Silence
- Limit Duration
Loudness (R128) Normalization is useful when you need to equalize the Perceived Loudness of all files if your audio collection to the same Target Level.
Check the "Adjust volume ..." option to adjust the volume of converted audio with peak or Loudness Normalization.
Click on the "Peak" button to change the Normalization Method to "Loudness" if it is not selected yet.
Target Level of Loudness Normalization
Press the "...LUFS" button to select the target level of Loudness Normalization, expressed in LUFS (Loudness Units relative to Full Scale). Please note that too high Target Level can result in peaks that exceed the audio format limits. Dynamic range compression is applied in such cases to prevent clipping. In normal circumstances, the recommended value for Target Level should be between -23 LUFS and -10 LUFS.
With Peak normalization, the gain is changed to bring the highest signal peak to a target level. Peak normalization is used to adjust the volume to ensure optimal use of the audio format in the mastering stage of a recording.
To normalize the volume of converted files using the Peak method check the "Adjust volume ..." option in the Effects tab and choose "Peak" in the dialogue window if it is not selected yet. To open the dialogue window, click on the "Loudness" button.
Target Level of Peak Normalization
Press the "...dBFS" button to select the Target Level of normalization, expressed in dBFS (Decibels relative to Full Scale). 0.0 dBFS is assigned to the maximum possible digital level.
Check the "Enable automatic volume control" option to increase the level of too quiet parts of audio files.
Automatic Volume Control is an excellent addition to normalization of audio with too loud and too soft parts, peaks, and clicks, including podcasts, interviews, and voice recordings.
Check the "Fade in ..." option to make the volume of converted audio gradually increased from silence at the beginning.
Check the "Fade out ..." option to make the volume of converted audio gradually decreased to silence at the end.
Click on the Seconds button to change the length of the Fade In or Fade Out effect.
Check the "Trim Silence ..." option to trim silence at the start and the end of the converted audio. We recommend using the Trim Silence option together with volume adjusting or normalization. Otherwise, quiet audio of low level can be unexpectedly truncated.
Click on the "...dBFS" button to change the Silence Threshold. Audio below this level will be considered as silence.
Check the "Limit duration ..." option to limit the length of converted audio. We recommend using the "Limit Duration" option to quickly check if conversion results are as expected.
Click on the Seconds button to change the maximum duration of converted audio.