Ringer and Alerts "Change with Buttons", Silent Switch and Bedtime
I don't understand what this setting does: Settings > Sounds & Haptics > Ringer and Alerts > Change with Buttons. It seems to affect my alarm clock when active. I wanted to mute my phone but not my alarm clock. So I turned Change with Buttons off. OK. But now when I get a text message the Ding sound is super loud even with my physical volume buttons set to the lowest setting.
So I was reading about the Ring/Silent Switch on the side. But according to this https://support.apple.com/en-us/HT203017, "When in silent mode, the alarms you set in the Clock app will still sound, and calls from Favorite contacts will still ring." Does it mute texts/imessage from favorites?
Last question, if I understand Bedtime it mutes everything except repeated calls from favorites. Can I tell it to allow the first call from favorites?
To try to be precise:
What does "Volume" refer to when adjusting the physical up and down buttons and Change with Buttons is off?
When set to Silent, does the Ring/Silent switch mute calls from non-favorites? What about texts/imessages from favorites? (I would be please if this meant I could hear calls/texts from favorites only and mute unknown robo calls for example).
How do these settings interact with each other? With Bedtime?
I really only want to hear texts/imessages and phone calls from people I know and have set as favorites. What combination of settings is best for that?
Thank you.
iPhone XR, iOS 12