Console Sound Manupilation

We will use your site in a game we are developing where players will watch videos simultaneously. We using CEF. However, due to your CORS protection, we cannot adjust the client-side audio volume using DOM manipulation even though we have done everything else. For security reasons, we do not allow viewers, i.e., players, to adjust the volume themselves with the mouse. How can we adjust the player’s audio volume via the console without being hindered by the CORS issue?