Multimedia audio keys assignment

Hi all, since I have installed pulseaudio I have a problem with the multimedia audio keys. Where are they configured? In particular when I press mute and unmute in KMix both pulse and "HDA Intel PCH" Master volume get messed and unmute does not toggle both controls, so that I have to open KMix and unmute manually. Any ideas? thanks in advance PS: I recall I have played with multimedia keys perhaps 6y. ago. No idea where it was - just vague memory that it was about remote control and my first tv card/stick.