Welcome to the forum! Sorry you are having a concern with your sound card. Please do not think that the lack of immediate response to be that no one is interested. I had to actually look up what a Barracuda sound card was, but even then, I am not certain what to suggest. With this being a world-wide forum, surely someone may have a suggestion. However, it might take a short while.
From your first post, it appears you are you getting regular and decent sound right now. If so, you are certainly ahead of the game in that respect. I know that certain audio applications such as Amarok have EQ capabilities, but I am not sure of anything in the regular GNOME setup. I use an embedded chip, so have never really done much research in that area. There are plenty of audio folks in here, so if anyone has a suggestion, it should be posted soon enough.
In the meantime, you might want to research your card in relation to Linux, Ubuntu, and EQ to see what might have been used by others. There just might be an audio application to fit your needs. I do that research method quite often and come up with plenty of interesting info. Good luck.