Normalize audio

First, make a copy of the file. Then do one of the following:

# normalize test.wav

normalizes at -15 dB ???

# normalize -a

Adjust the RMS volume to the target amplitude AMPLITUDE; must be between 0.0 and 1.0. If a number suffixed by "dB" or "dBFS" is specified, the amplitude is assumed to be in decibels from full scale. The default is -12dBFS.

# normalize -b

BATCH MODE

When operating on a group of unrelated files, you usually want all of them at the same level, and this is the default behavior. However, a group of music files all from the same album is generally meant to be listened to at the relative volumes they were recorded at. In batch mode, all the specified files are considered to be part of a single album and their relative volumes are preserved. This is done by averaging the volumes of all the files, computing a single adjustment from that, and applying the same adjustment to all the files. Some analysis is also done so that files with volumes that appear to be statistical aberrations are not considered in the average. This is useful if you have albums (like many of the author's) in which there is one "quiet song" that throws off the average.

# normalize -m, --mix

Enable mix mode: see MIX MODE, below. Batch mode and mix mode are mutually exclusive.

# normalize -n 

Compute and output the volume adjustment that would set the volume to the target, but don't apply it to any of the files (i.e. skip the second phase). If you use this option, your files will not be altered in any way.

# normalize -a -15dB test.wav

sets average level to -15 dB. The default is very good, so -a is not often necessary.

# normalize -p

uses peak value for basis of the average.

# normalize -l

uses limiter