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When I play a number of .mp3 files the volume changes significantly sometimes. What parameters should I use to scale multiple .wav files to the same output volume

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  • You might use application normalize-audio to first normalize your .wavfiles, or after conversion to mp3 to set "a relative volume adjustment frame in their ID3 tags" (see man normalize-audio).
    – ridgy
    Mar 3, 2017 at 14:57
  • There are --replay-gain- options in lame, but they set the replay-gainID3 TAG, which is "not widely supported and I think it has been superseded by RVA2 in ID3v2.4" (id3.org/Replay%20Gain%20Adjustment).
    – ridgy
    Mar 3, 2017 at 15:11

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