I'm sorry I couldn't write earlier - I'm swamped with work at the moment.
KneeTheCap: Heh, noticed a fun tidbit. If I have skype on before starting playclaw, playclaw cannot find stereo mix in it's input options. But if I turn off skype it finds it. If I start playclaw first, then skype, it lets me choose stereo mix. I tried recording with just skype on and not calling anyone, nothing changed. Skype does not raise the mic volume by merely being on.
And yes, lowering the gain-thing in VIA control panel, it lowered the volume of my voice. It also affected on the bars in the windows audio window. When the gain-thing was at 0, I could hardly hear anything, even when I blew into the mic.
Does that help?
The Skype thing is normal; I guess is a driver thing.
As for the other thing: so the gain slider does work, huh? Could you please try changing the volume sliders and see if that also affects the sound (and the display)?
Everything is pointing at one direction: Skype enhances the volume, while other software does not. Still, you should be able to record with same quality (if Skype is boosting the sound it should also boost the noise floor). If it's at all possible, could you please record some spoken words with Windows Sound Recorder and Skype? I'd like to compare them and see if that's the case.
I'm sorry if I'm asking too much, but... I don't see any other way.