Messenger

The “Messenger” is the bit of code that manages the overlays in the graphics window. Currently this includes things like indicating what song is playing, eg:

If you have a rotation going, it will say who is singing the next song:

It will show when you change the pitch:

And also shows when you change the tempo:

Eventually it will show the (independent) volume levels of the microphone(s) and the music.
Also, the user or KJ will be able to create their own messages that can scroll across the screen, eg: "Tip Your Waitress" or "Drink Specials for the next hour" or whatever you want.