alsamixer didn't do the trick. It was at about 75, I set it to 100, the sound was a little bit louder, but still quiet.
But, guess what. I, once again, used draksound to change the drivers and this time it worked. I got nice, clear sound. This must be a non-alsa driver, because I can change the volume using KMix, while alsamixer doesn't find any devices. But it works at last...
Off to toy with the system now, thank you very much.