Unfortunately this doesn't work for notifications such as 'lap times' from the Garmin app. This is also considered media by the phone.

That can be fixed with Garmin notification sound being treated as a notification sound.

Adding per app volume control is IMHO a really bad UX. It means there's a master volume and then per app volume is like a coefficient the app volume is multiplied by.

My car has its own volume control separate from the phone bluetooth volume and I hate the experience of having two volume knobs interacting with each other when all I want to do is to increase or decrese volume

> Adding per app volume control is IMHO a really bad UX.

I really prefer it for having different things set at different volumes. Like presets.

The media volume slider is joint across the apps though if they aren't notifications.