Navigation (Text To Speech) audio to various outputs (Bluetooth mono in car)

1 - Open SoundAbout
2 - Set "Media audio" to "Let app decide"
3 - Click on "Text-To-Speech behavior..."
4 - Set "Audio output..." to what you want.  (example:  Bluetooth (mono))
5 - Google Navigation will request ALL of the directions at the beginning of the trip.  This won't work as we need to switch the audio dynamically when the direction is needed.  
   To help this, I set "Max utterance per request ..." to 1 or 2.
6 - If using Bluetooth mono, you may need to set "Delay utterance (secs)" to 1.5 or 2.  This will allow time for the audio to switch to Bluetooth mono, which is slow to switch over.  If you don't, you may miss some of the directions.
7 - Click on the "Android TTS settings..."
8 -  You will see some TTS engine choices.   Choose "SoundAbout TTS".
9 - Click on "Listen to example" to see if audio comes out of the desired output.