Ok this bug will only show as a problem when you have multiple audio devices within your PC.
Changiing the prefered renderer within MP or the OS and the MP volume control isn't mapped correctly to the second audio devices mixer but stays with the first audio devices mixer.
There are no logs to show this as a bug but simple testing of all possible options and the Volume control is always mapped to the main mixer and not the actual mixer for the second device which has a seperate mixer than the main volume mixer.
Changiing the prefered renderer within MP or the OS and the MP volume control isn't mapped correctly to the second audio devices mixer but stays with the first audio devices mixer.
There are no logs to show this as a bug but simple testing of all possible options and the Volume control is always mapped to the main mixer and not the actual mixer for the second device which has a seperate mixer than the main volume mixer.