Earlier quoted context omitted.
So, on Android, if you know it's going to blast out, you can't go into settings from the notifications shade and change the volume for Music, video, etc. to a reasonable level? I can on mine...
Yes, this is what I do. It would be nice to use the volume rocker to do that.
You can touch the screen to drop the selector, click on which volume you want, and go ahead with using the rocker for that volume selector.
To silence app-audio, I use just: volume-rocker, click on down arrow, click on music icon to mute. That's it.