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From:  Nikos Chantziaras <realnc@arcor.de>
Subject: [gentoo-user]  Re: Decreasing volume of an mp3 audio
Date:  Mon, 24 Aug 2009 21:35:44 +0300
Organization:  Lucas Barks
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References:  <20090824173254.GB6143@solfire>
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On 08/24/2009 08:32 PM, meino.cramer@gmx.de wrote:
> Hi,
>
>   is there an application, which is able to physically decrease
>   the volume level of an mp3 with as less as possible loss of
>   sound quality.

Unfortunately, no. There's no way to do that since the mp3 format does 
not support any kind of "volume" meta information.

The only way to get lossless volume change is to use "Replay Gain", a 
method that inserts volume alteration information inside the mp3's ID 
tags.  However, the player that will then play back the mp3 must support 
Replay Gain.