Hi all, I have little idea about audio terms, and the following always intrigues me: When I open KMix, the KDE Mixer, I can change the volume of both "Master" and "PCM" which both change the music volume. I can also control the volume of "AC97" but that has no effect while playing music. Can someone please explain what are those settings and what are the differences between them. This is my sound card: [xxx@localhost xxx]$ lspci | grep -i audio 00:1f.5 Multimedia audio controller: Intel Corp. 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) AC'97 Audio Controller (rev 03) Regards, Hillel.