If you want to have everyone in the mix, its quite simple but it might take a second to get used to. Basically, when you click on a character it gets put back down there, but if you spam click it, it'll linger for mere split seconds, and in that time you have to try to drag someone else in. i reccomend trying to put them as low as possible (like red, green, and cyan sorry idk their names) so you have room to shove in other ones. i might post a video later showing me do it but ive ran out of time today. happy mixing :]