Poor audio quality + Mic doesn't work

My sound is quiet, sounds muddy, and cracks a ton on max volume (which is still quiet).
Do I need to install some realtek drivers?
Also when I use the volume mixer, it gives me some error message: “Unknown application: audio-volume-change”
Also, neither Kmix nor PulseAudioVolumeControl can detect my microphone, so it isn’t working.

P.S.: I upgraded from KDE4 to Plasma5 (Installed Opensuse today)
P.S.: my motherboard is ASUS 990FX R2.0

please do not post the same problem in multiple threads. You must allow a bit of time because plasma 5 is new and more or less still a bit beta and not all that many are using it. It may or may not have a impact on your problem.