Or if you want a Windows GUI app then MP3Trim is good (http://mp3trim.8m.com)
Ross.
Mark Taylor wrote:
> >
> > > Is it theoretically possible to amplify the sound in a mp3 file without
> > > reencoding it? What would be the quality loss of this operation?
> >
> > Yes: modifying the global_gain field in each channel of each granule in a
> > Layer III frame has the effect of amplifying or diminishing the decoded signal
> > in increments of 1.5 dB.
> >
> > There is apparently no quality loss associated with this change as long as the
> > signal is not amplified so much as to cause clipping.
> >
>
> This utility will do exactly that:
>
> http://www.chat.ru/~lrsp/English/index.html
>
> Mark
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