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I can use audacity to increase the volume of an MP3 file. However, if I want to use this on a regular basis it's a hassle, since I have to fire up audacity, load the file, increase the volume and finally export it back to MP3.

Is there any command-line program I can use that will increase the volume?

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up vote 5 down vote accepted

mp3gain can do this:

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Yep, using mp3gain too. Has both command line and GUI interfaces. – axk Jul 28 '09 at 19:44
its good tool for sure – demetri Jul 31 '09 at 6:49

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