There's a few different types of tags that can be in MP3 files. The most common type is "ID3" (and now-a-days ID3v2). Another type is "APE". For some reason APE tags are less
supported than ID3, and it would appear that sometimes they actually cause problems.
For instance the music software "J River Media Center" does not currently support APE tags (I think I heard it's coming in version 13), so anything written within an APE tag cannot be read or written using Media Center.
Some programs write the ReplayGain settings into APE tags (why I wonder) I guess others use the standard
ID3 tag for ReplayGain (I suspect this is what Media Center uses).
...anyone know what is meant by the bit in bold
You can and should turn that 'feature' off as it uses an non-standard tag (APE) to hold the info
I'm not sure what program GHammer
is referring to, but it must place the ReplayGain info into APE tags. Perhaps he's talking about dbPoweramp, which for some reason seems to have started using APE tags in version 13 (while version 12 didn't).
does that not stop it from completing it's main purpose ?
Yeah, sounds like it to me. I would guess GHammer
is suggesting that a different
ReplayGain (which is the same as mp3gain I think) implementation is a better way to go. Media Center has an "Analyze Audio" option that will scan your whole collection. You can set it to skip songs that have already been scanned. It also has a very cool option that lets you choose how many processes you want to do at once. So if you have a multi-core CPU you can get your collection scanned much more quickly.