As mentioned in this thread https://wiim.community.forum/threads/how-work-volume-control.511/#post-5960 you should leave pure Optic output with no way to influence it and apply inappropriate labels to it.
P.s. Everything related to volume is a serious matter that must be implemented guided by good practice, but if there is none, then you have to borrow.
P.s. Everything related to volume is a serious matter that must be implemented guided by good practice, but if there is none, then you have to borrow.