Intrusive sounds when using Commands

This is probably another one of my stupid questions, but my cubase programme has suddenly, for no reason I can figure, decided to start playing a high pitched pinking sound when I press the play or stop buttons and a different twanging sound that I can’t really describe when I open the equaliser. I’ve looked all over the software menus and I can’t find anything that relates to turning this feature, if that’s what it is, on or off. Quite why anybody would want noises being introduced, especially when recording, I’ve no idea, but now I’ve got them they are a real nusinace.

So how do I get rid of them?