Re: MP3 Gain/Replay Gain

Hi Stan,

Thanks for the detailed reply.
What I meant by ?'Audiotron implementing the gain adjustment' was,
basically:
-If I MP3Gain my mp3's, will Audiotron read the gain tags and modify the
ouput gain accordingly on playback?
OR
-Does MP3Gain 'work' with Audiotron?
I seem to be finding different answers to this.

thanks,
roman
----- Original Message -----
From: "Stan Abeln" <audiotron@xxxxxxxxx>
To: <AUDIOTRON@xxxxxxxxxxxxxxxxxxxx>
Sent: Sunday, March 07, 2004 5:27 AM
Subject: Re: [AT] MP3 Gain/Replay Gain


> Hi Roman,
>
> > -will Audiotron implement the gain adjustment?
>
> No, the AudioTron currently does not do gain adjustment itself.
> However, I believe that it is possible to have the AT do "real-time"
> gain adjustment.  It would have to read some "gain" tag value from the
> MP3 file and adjust the output volume accordingly.  Note that the AT
> would only be able to adjust the volume of the analog outputs.
>
> > -does it work well in the real world?
>
> I think most people on this list agree that gain adjustment using
> MP3Gain works pretty well.
>
> > -can the gain adjustment be undone?
>
> Basically: yes.  Older versions of MP3Gain generated log files that
> contained the gain change applied by MP3Gain.  To undo the changes, you
> had to apply the reverse change to the MP3 files one by one.  Newer
> versions of MP3Gain add an APE tag containing the analysis result to the
> MP3 file.  That way, the gain changes can be undo automatically.
>
> But there's a catch.  The "undone" MP3 file is not always exactly the
> same as the one you started out with.  (Even if the APE tag is removed.)
> At least, this is what I think after studying the MP3Gain source code.
> And I'm also not sure if this actually happens "in the real world".
> Now, let me try to explain.  If eg. the MP3 file contains frames with a
> "gain" value of 1, and you adjust the gain by -1, the new gain value for
> those frames will be 0.  When you undo the change, MP3Gain will not
> restore those frames to 1 (because of a "wrapping" protection scheme).
>
> My point is: the MP3Gain "undo" does not always yield the original file.
>
> > -the recent LAME 3.95.1 adds a Replay Gain value to the "LAME
>    tag/header". This is distinct from the ID3 tag, and not usable by any
>    hardware/software as of yet?
>
> LAME stores the ReplayGain value in the LAME tag.  That is not the same
> as an ID3v1 tag, not the same as an ID3v2 tag, and not the same as an
> APE tag.
>
> Stan
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