One obvious solution is to have, say, an extra flavor of mute. Say a soft mute and a hard mute, where soft works like the current iOS mute and a hard mute which

One obvious solution is to have, say, an extra flavor of mute. Say a soft mute and a hard mute, where soft works like the current iOS mute and a hard mute which is a true absolute mute. And give the user a physical switch or in-software toggle between them. Next problem.