i have used mp3 and soundforge to raise the levels of MP3s that needed it…no issues…
i believe alot of people on here have used mp3gain with no issues…
unless you are talking about the aacgain aspect of it…because of what i read i didnt feel to encouraged to try it…unless i made duplicates of all the itunes tracks…
If you’re using the music you’ve purchased for mixing this is preferred: even normalised you could end up playing on a bung system that’d require you to adjust gain manualy in any case. Best you’ve had the practice already.
Also, you wouldn’t want to introduce any artefacts to the audio.
If you’re simply listening to them, pretty certain iTunes has a normalisation function, which uses the first track played as the benchmark.
mp3gain/replaygain adjusts tracks’ gain in increments of 1.5db. traktor’s autogain uses finer 0.1db increments. therefore, imo, there’s no point bothering with mp3gain unless you’re doing it for purposes other than digital DJing.
assuming aacgain does the same thing as mp3gain, it has the potential to be a waste of time as well.
I’ve never used an “autogain” always used the gain nob on the mixer. If you’re concerned about what the program does, I’d err on the side of what you already know how to do.
ok, i just read it. seems to me aacgain is nothing but a front-end that takes care of AAC decoding. the way it computes the loudness of audio files is identical to mp3gain (i.e., by means of the replaygain algorithm).
to clarify, i am just saying that replaygain doesn’t make sense for use with traktor as traktor comes with a capable loudness-adjusting mechanism (autogain). if, however, you play back your audio with certain media players, it may make sense to run your stuff through mp3gain or aacgain. but itunes is not one of those media players as it includes an apple-developed proprietary alternative to replaygain called sound check. (i can’t speak to the quality of sound check as i don’t use itunes.)