IVOLUME FULL VERSION FREE
So if you are trying to convert 1GB of music, make sure you have 1GB of free space in the directory. Also during converting, it will create temporary files (because of -t) and will require disk space of the same total amount as size of original files. k means automatically lower this number if clipping may occur, -t is required to make the file as compatible as possible with different players (iPod Shuffle may have problems otherwise), -p means preserve timestamp of file (optional). Here's what I use: aacgain -r -p -t -k *.mp3 *.m4aThe above command will adjust every track in curent directory to 89dB volume.
Read the rest of the hint for a few notes. For more details, check the forums on Hydrogen Audio, the mp3gain web page, and the AACGain web page.
IVOLUME FULL VERSION FOR MAC OS
I tried to find a version of aacgian compiled for Mac OS X, but failed, so I made it myself, and put it on my friend's web server. It's called AACGain, which supports both MP3 and AAC formats, has a port for Linux, and can be compiled on Mac OS X, too. Recently mp3gain was further improved to support the AAC format, and now we have our ultimate solution. This means that there is no quality loss. So here comes another open source tool, mp3gain, which uses a lot smarter method of volume adjustment, and relies on an MP3 format feature to adjust volume gain without transcoding. I'm no expert at this, but smart people say that volume perception by the human brain is not that simple, and to adjust it properly it should be taken into account. ITunes actually has the ability to fix this kind of problem with the Sound Check feature, but unfortunately the method by which Apple corrects the volume is not the best one - it definitely changes volume, but it still doesn't sound quite right. But without adjusting the volume, the music just doesn't sound right - it's either too quiet or too loud. But if you are converting it to MP3 or AAC formats, and intend to listen to tracks from different albums randomly, the situation gets much worse: having to adjust the volume for each track is really annoying. So when you are just listening to one CD, this is OK: you only need to adjust volume once and listen the whole CD. There is a very common problem with modern CDs - they are all mastered at different volumes.
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