Normalizing AAC (m4a) files with AACGAIN

[Rubio]

I've ripped a few hundred CD's with iTunes and uploaded them on my
iPod. The problem is they are all of different loudness level. I
thought I could normalize them with AACGAIN. I've tried many different
command line options, but can't hear any difference in the processed
files. Some of the music are pop/rock, some are classical which
obviously have a wider dynamic range. Since iPod can produce very
limited sound pressures on my headphones, I'd like all songs to be as
loud as possible.

[fred-bloggs]

Post by Rubio
I've ripped a few hundred CD's with iTunes and uploaded them on my
iPod. The problem is they are all of different loudness level. I
thought I could normalize them with AACGAIN. I've tried many different
command line options, but can't hear any difference in the processed
files. Some of the music are pop/rock, some are classical which
obviously have a wider dynamic range. Since iPod can produce very
limited sound pressures on my headphones, I'd like all songs to be as
loud as possible.

Have you tried using AACGAIN with the mp3gain GUI?
You need at least v1.2 of aacgain and v1.2.5 of the GUI.
http://www.rarewares.org/aac.html
http://mp3gain.sourceforge.net/download.php

Un-zip aacgain.exe, re-name it to "mp3gain.exe", and move it into the
MP3Gain folder, copying over the existing mp3gain.exe. Now MP3Gain should
handle AAC files (.m4a or .mp4)