Right now, the "master channel" uses the pa_cvolume_avg of all channels. https://github.com/KDE/plasma-pa/blob/master/src/volumeobject.cpp#L41 The avg is also used in setGenericVolume too in context.h https://github.com/KDE/plasma-pa/blob/master/src/context.h#L99 If you set the left channel to 50% and leave the right channel at 100% (via pulseaudio etc), the "master channel" will be the average of 75%. If you then raise the "master channel" by 10%, you raise the right channel to 110%. Video: https://streamable.com/2kp7m Ideally the "master volume" should be the maximum channel volume so that you can't unintentionally boost a channel over 100%. I can probably try making a diff + testing myself, I just wanted to confirm this isn't some weird linux convention first.