Glad I could help, you do know that you can just turn the volume up during a phone call and it will set at that volume. Same goes for nav volume.
Yeah I knew that one already, seems really quiet on max vol unless pootling along....
When your on a call try turning up your volume on your phone during a call maybe? What phone do you have?
Yeah max vol whilst on the call, I'm pressing vol up on phone and steering wheel. Its fine driving under 50 but motorways ýou can't hear the caller easily. Maybe I expect too much. My phone is a OnePlus 3T.