Where does kmix get its tray icons for the different volume levels? After checking "apt-file search kmix" and "find /usr/share -iname '*kmix*'", I suspected they were coming from /usr/share/icons/oxygen/*/status/audio-volume-*.png but after replacing the audio-volume-high.png icon for every size and restarting kmix, it is still using the default icon.

The default icons are located at /usr/share/apps/desktoptheme/default/icons/. You can change the icons by placing a svg(z) file named audio.svg(z) in ~/.kde(4)/share/apps/desktoptheme/<your desktop theme>/icons/.

(.kde/.kde4 depends on your distro and <your desktop theme> is the name of the desktop theme you currently use.)

Hans wrote:You can change the icons by placing a svg(z) file named audio.svg(z) in ~/.kde(4)/share/apps/desktoptheme/<your desktop theme>/icons/

So it's just one file? How does it differentiate between volume levels/mute?

Also, I opened "/usr/share/kde4/apps/desktoptheme/default/icons/audio.svgz" in inkscape, and it does not appear to be the same icon set as I see in kmix in my try. I am using tint2 as my panel, not the default kde plasma panels.

You'll see that there are different icons in that file if you open it in e.g. Inkscape and they have different object ids.

I have no idea what icons tint2 use, it would help if you could post a screenshot of your system tray.