I don't know if this has anything to do with microphone input and I don't run KDE, but I had a conflict in audio output, and Just19 pointed me towards PulseAudio, searching from there I found "libalsa-plugins-pulseaudio" in the repo, which has this description:
Alsa to PulseAudio backend
This plugin allows any program that uses the ALSA API to access a PulseAudio
sound daemon. In other words, native ALSA applications can play and record
sound across a network. There are two plugins in the suite, one for PCM and
one for mixer control.
Seems like it helps to link alsa to pulseaudio, I installed it and my conflict went bye-bye! Maybe it can be of some use, good luck!