Not sure about this but, I think there are some options in windows and or volume control/directx about your "recording" volume. I'll try to find it later. Gotta go right now.
I haven't had much luck with the db increase or decrease thing. I know I have seen a record volume option somewhere. Just not sure where, lol ;D
Edit: Found a bunch of volume control options in Goldwave. I use Goldwave to reord and edit music and sound, then I use dbPowerAmp to convert to .ogg. They both are cool programs.