Sync volume control? I'm running 7 on my Galaxy s6. Is there an app or setting I could change to where all the volumes are the same when I change them? 
(Ex when the media is half way, all of them are half way)
Volume Sync- Sync your Volume does exactly that

It can sync all the volumes - Notification, Media, System, Alarm and In call volume together or selectively as you want

I didn't try them all synced at same time but it worked well -just installed, tested briefly