Zdroj is more or less correct. However, I think I should clarify a few things. I might have been a little hazy in places. Firstly, Zdroj's instructions are a tad longer than necessary. Those steps are the same as pulling the Audigy, Maxing the volume, and then putting it back in again. The Audigy may appear to be at maximum volume, but it is being affected by the volume that was used before you put the card in. You have to max the volume EACH time BEFORE you put in the Audigy. Also, maxing each of those volume controls is very important, whether you're using Realtek or Audigy. I believe that is step 9 in my guide, like I said, I may have been too vague there.
BTW: If for some reason even when you close all of your sound applications and you still get BSODs (happens to me once in a while), I recommend logging off, yanking the card, and then logging back on. It's damn-near guaranteed to work then.
Also, as for volume difference, I haven't noticed a difference between using or not the card. In performance, however, I notice a big difference. I think these little lappy speakers perform very well (never mind the size of the actual "lappy"). Sure, it isn't always enough, but if you have the Audigy you should be trying to get some kick-a$$ speakers for the occasions when you need to shake the room.
