SUMMARY

Microphone's monitoring channel volume level does not scale linearly with sensitivity. Normally, if you lover the output volume, the monitored volume still ranges from 0.0 to 1.0 but UI scales it down to 0..volume range so that it does not go out of slider's groove range. But the microphone apparently does not work that way. The less sensitivity you set, the less will be the range of monitored volume, and that scale is not even linear. For example, at 50% sensitivity, I only get up to ~45% on volume monitor, and at 25% sensitivity it won't go above 7%.

STEPS TO REPRODUCE
1. Play music that has constant volume on average, from a source that is located at a fixed distance from your microphone.
2. Change microphone's sensitivity via Plasma Volume applet.
3. Observe the maximum value to which volume monitor (darker groove on the slider) raises at peak volume levels.

OBSERVED RESULT
The lesser the sensitivity, the smaller the range of volume monitor.

EXPECTED RESULT
Volume monitor should stay in 0..1 range, regardless of sensitivity.

SOFTWARE/OS VERSIONS
Operating System: Arch Linux 
KDE Plasma Version: 6.0.80
KDE Frameworks Version: 5.249.0
Qt Version: 6.6.1
Kernel Version: 6.6.7-arch1-1 (64-bit)
Graphics Platform: X11
Processors: 8 × Intel® Core™ i7-6700HQ CPU @ 2.60GHz
Memory: 15.6 GiB of RAM
Graphics Processor: NVIDIA GeForce GTX 970M/PCIe/SSE2

pipewire: 1:1.0.0-2
pipewire-pulse: 1:1.0.0-2
pulseaudio-qt: 1.3-1