I have been using Audacity for years and it is great but with my Win 7 computer I can NOT lower the input when I have the recording set to "stereo mix".
I use stereo mix setting to record music off of YT.
Adjusting the 3 sliders in the photo below
does nothing to lower the INPUT signal
, it still pegs out in the red most of the time.
There are NO settings in my computer except "line input" which I can set to 10% and it will still peg out.