I hope I'm in the right spot for this.
I have my volume on the phone set to 100%. I connect via bluetooth to my car. My car's radio volume goes from 0 to 45. Now, when I listen to music, my car's volume is set to 10-15. However, when I listen to a book from Audible, or make a phone call, the radio volume needs to get at 37+ to be able to hear it. Is there anything I can do to equalize the volume between apps?