I was having this strange sound issue happening to me last night when gaming and using my headphones.
When not using Mumble all sound would come through the headphones like its supposed to, however, when logging into my group's Mumble channel the game sound and Mumble sound effects could not be heard through my headphones but instead were "pushed" to the desktop speakers. Through the headphones I could still hear and talk to the other people in channel. What do I need to check to make all sound comes through the headphones? Is this a setting issue that I have to adjust?
Appreciate the help!
If you go into settings, there is an option to show advanced settings, that will give you the audio output options, where you should be able to select your output device.