In VR the aircraft sounds come through the main speakers and ATC comes through the VR headset, however FSRealistic also comes through the headset. It's preferable for FSRealistic to come out of the main speakers as well as the engine sounds. A way to select the output device would be very useful.
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In Windows 10 you can use the "App volume and device preferences" in the Advanced sound options of the Windows settings to set where the sound is played. Have FSRealistic running and it will display in the list of active programs. Then select the appropriate device for output.