How can I set the default audio volume for Siri playing music on HomePod?
Upon some experimentation, the issue I’m having is that each device that connects to HomePod changes the “last volume” so if I forget to turn down my Mac volume when watching a video or show with low volume (or I’m really rocking out to some music) then the next time I ask Siri for the weather early in the morning, I will continue to be surprised by volume louder than I expected.

I’ve put in a feature request to reset the volume after 60 minutes to a low or pre-set level, but I’m not holding my breath Apple implements that or uses the microphones to realize the house has been silent as a mouse for an hour and adjust her volume to be an indoor voice in the morning after a night partying.