Everytime I launch the game it is ear blastingly loud. I have disabled music and dropped the volume levels down to reasonable/low levels, but nothing changes the startup videos. I'll follow up with more information if it effects campaign cinematics too. This was a problem in the last game too.
Looked into it some more today. It looks like lowering the sound specifically for BFG2 via the Windows Volume Mixer will adjust it. Looks like it is outright ignoring in game sound settings and using windows volume settings instead. Oh, I'm also on Windows 7 if that helps.