I think I've sorted it... I have to have system sounds up at around 75%. I think it's then from the gameplay rather than the mic. Does that sound right?

I wonder if someone can help. It's probably something very simple, but I can't see what... When I record video of me playing a game, I'm getting my voice through the mic, but none of the games sounds. I have 'Record system sounds' selected. If, while recording, I come out and select 'Test' on my spe...