I did a quick search of the forum and while I found a few people asking this question, I don't see any answers. Does sweep work with flac?

Sweep is just a tool to execute programs in all sub folders. It will work with all programs.

So as long as replaygain.exe works on flac files on could use something like this



to apply replaygain to a folder hierarchy of flac files, right?

No. Since the replaygain.exe is for mpc.

you have to use metaflac.exe included in the flac package.

OK. What is the difference between using metaflac.exe and using the replaygain function of foobar?

There shouldn't be one.

Excellent!