Hi all,
I pushed update just now. Mostly I added controls for volume and rate for text to speech. I wanted to add output device but I can’t get Speechsynthesizer to work with different device even from Naudio. C# is not my native language I mostly learned it only to write this app so if here is any experienced C# dev and willing to give some hints how to solve this issue will be great 
I found workaround to force it to go through different device instructions below.
- Open application and set for a flight
- Play instruction for firs waypoint (this is important otherwise sometimes is not appearing in mixer)
- Go to System->Sound
4. Click on Volume mixer
5. Find BushTripManager and change output device to one you want. (I usally running it through headphones with bushtalk radio)
6. Restart BushTripManager again for some reason is not reacting for default output runtime only app restart works.
I will update app once will figure out how but for now above does the trick