Ugh, the annoying PulseAudio that sometimes makes your volume suddenly much louder or much softer when you want to change it by just one notch, just because it wants to try to be "smart" with different applications or whatever thing I don't care about it is that it tries to do, there should be 1 volume slider and it should work correctly period (and without lag - another thing PulseAudio introduced).
Oh how I miss the simplicity and elegance of before PulseAudio (and its evil twin "hi-let-me-put-your-text-logs-in-a-binary-format"-systemd) appeared in ArchLinux.