Thanks for the reply. I dont see the "Use device audio" option but the "output audio to stream only" is already highlighted, i had able to mute the windows audio by clicking the speaker above the 'start stream button' as youu suggested. The thing is, i want the game audio coming through my mic headset speakers but i appear only to be able to do this if i tick the 'Output audio to desktop' in the capture device settings within OBS, if i do this then the game sound comes through my headset speakers but so does windows desktop audio as well which i do not want, if i click the speaker above the start stream button in this mode then it just kills all audio and nothing is recorded/streamed.
Is there a way to get the capture audio coming through my headset speakers whilst filtering out any desktop sounds that might happen during recording/streaming?