Queries about "compilation" tag and AlbumGain about qaac HOT 1 CLOSED

In single file mode qaac -help indicates --compilation is available for tagging. I'm not sure how to use this field.
Do you need to supply a value? e.g. --compilation="true" or --compilation="false", or do you supply a boolean value TRUE or FALSE e.g. 0, -1, or is the presence or absence of a compilation tag alone without an associated value the way to use it?

"--compilation" takes no argument. When you specify this option, compilation tag is created and the value is set to 1.

If you don't know the meaning of the compilation tag, google "iTunes compilcation".
This tag is used by iTunes to group multiple artists album.

However, I (personally) don't use this at all. Many people just use "Album Artists" for that purpose. Now iTunes also supports grouping with "Album Artists", therefore I doubt this tag is still in use.

The second query is to do with where QAAC picks up albumgain tags from. >Essentially does qaac or the qucktime dlls have the internal facility to perform replay/album gain scan and tagging on submitted files?

No.

qaac / QuickTime doesn't do that job. iTunes has a feature called "Sound Check", which is like replay gain, but a different monster.
qaac also ignores replay gain tags in the original source file (if present).

This is intended, because gain might be slightly different after the encoding.

from qaac.