If you have any critisim toward this, just remember, i made this in 2 hours. there may be some bugs by the way, which will never be fixed.
New idea for the engine, add a function where you can control when you solo a polo or character, whatever they're called you can adjust how much volume the other characters have when muted when that character is soloed, and maybe make that the same for when the polo or character is muted, and one more thing, when a character is placed, when the placed polo's icon is clicked, it removes the character. (You do not have to add any off this is you don't want, just an idea I came up with.)