AudioNormalize

AudioNormalize[audio] normalizes audio so that the maximum absolute value of its samples is 1.

AudioNormalize[audio, model] normalizes the audio signal based on the specified model.

AudioNormalize[video] normalizes the first audio track in video.

Examples

Normalize audio volume:

audio = ExampleData[{"Audio", "Bird"}];
AudioNormalize[audio]

Please visit the official Wolfram Language Reference for more details.