If I use Wavgain on my wav files before compressing them to the FLAC format, do I still have to use the replaygain function in foobar2000 on the FLAC files?

No, but I'd leave the WAVs alone and stick to replaygaining on playback - that way you still have the original files.

ok thanks, just to make sure I get the picture....I leave the original wav files as is, and encode to FLAC...then apply replaygain to the encoded FLAC file (from what I've heard, is this very similar to how vorbisgain writes the replaygain value straight to the vorbis tag?)
is this correct?
-BI2k4

flac tag writing is not supported yet, so your replaygain info will exist only in fb2k's database.

In flac 1.0.5 you will be able to do "flac --replay-gain *.wav" or "metaflac --add-replay-gain *.flac" and it will calculate and add tags in the flac files the same way vorbisgain does, using the same tag names and same format for the values.

Josh