I've always wondered why iTunes' "Sound Check" feature (basically their implementation of replaygain) was spotty at times...turns out it completely fails to perform any sort of volume analysis on VBR (variable bitrate)-encoded files.

I used to prefer 320kbps CBR for my mp3 files but I've switched to downloading VBR from Bandcamp (I think this is -V 0 or -V 1, something like 240kbps) in an attempt to save on some disk space.

What really confuses me is that I haven't found anyone reporting this issue at all even though it's plain as day if you know what to look for.  It's not a huge deal for me as I rarely enable this feature, but I use it when playing music for dances......nice to know that it actually will only work half of the time, sigh.  Yet another argument for pre-editing every single audio file that I use for dances.  I may as well just create an FL Studio project with my entire setlist in advance at this point lol