You say you have explained how to do this in your 6 other posts above. Well you haven’t really explained much. You just briefly say something without going into any detail so i am still none the wiser. I have looked at the Fireface manual and can’t see anything about changing the windows sound output. I have also looked at the Cubase manual about setting up busses and it doesn’t say how to change the cubase master playback channel. If you know how to do it i don’t know why you can’t just say step by step what to do.