Hi Rambler, from Avoid highways to Issue spoken instructions even during telephone calls is the same. My then says, Audio stream: Use "Phone" to adjust the volume of spoken instructions independently of the music volume. Alternatively, use "Music" if you encounter problems playing spoken instructions. Then I can choose Phone or Music. I have Phone turned on. Then Frequency of spoken instructions I chose Medium and I do not have a volume to the current media volume setting, and lastly TEST VOLUME. Thanks for the quick response.