And again, is there any detailed tutorial for Linux sound configuration.
My limited observation tells that most GNU/Linux distros use ALSA, so it is most advisable to learn how to use its native commands regardless of where and which distro we are running. The first recourse for knowing about ALSA is found in your hard drive which may vary from distro to distro, in my case [Slackware]: /usr/doc/alsa-utils-1.0.17/README-alsa-utils; there is also a good tutorial for it here
; it is most advisable to learn control ALSA from the ncurses under command line, a short tutorial is here
Usually we wanted to progress into gaining more control over media formats like converting from mp3 to another format, or even dare edit the digital file. There is a short tutorial here
concerning how to use Grip
either in CLI or GUI. That would be a good start.
By the way before I forget, under your Kde, to automate calling 'Kmix' volume control you can put a 'button' on your task bar. Right click the task bar, click Add New Item then scroll into an icon for the Volume Control, then apply it. Kde is very rich on applications, I often feel overloaded by it
If it doesn't give you the button there is another way of placing a button in the task bar, just call my attention if you need to hear about this.
Hope it helps. Good luck.