Modify Ogg stream within a Ogm?

[Flash_Git]

Right, I have about 20 Ogm files and the volume of each is too low. So what I want to do is add a vorbisgain tag to every ogg stream. What I can do is demux every file, add the tag and then remux but I was wondering if there was an easier way, preferably one that wouldn't force me to demux and remux every file.
As far as I'm aware this should be possible as it just involves adding a couple of lines to one of the streams but is there actually a tool to do this with?

Thanks.

[Koepi]

Open the file in vdubmod, go to stream list, add the tags, and set video to direct stream copy. Then save again as OGM but with a new name. should work.

Regards
Koepi

[Flash_Git]

Damn that's annoyng, I tried VDubMod before but I didn't have a good enough look to realise it would let me add tags and everything. I did things the long way round, although I used Winamp to add fixed postgain to the lot rather than replaygain to save time. Was able to write batch files so it wasn't too bad, OGMDemuxer really needs to handke wildcards though.

Thankss for the help, will remember that in future.