How to set sound to be the same on dual monitors. Clicking between stops one and starts other.?

Just because you have two monitors. that doesn't mean they have two operating systems all its doing is enlarging your monitor.

You simply select your sound mixer then lower sound of game and raise sound of music.

+ if you want one monitor to be looking at your desktop and another on your game you should fix that from game.

A lot of games ask you how many monitors should we use, that doesn't mean they will be using both of them for gaming but they will simply make one screen dark and another for game

so remember to select in game's graphics option one monitor and use another one for whatever you want to watch see or listen