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. You can cause this to happen at any time by picking from the menu: Video->Messenger Rotation:
It will show when you change the pitch:
And also shows when you change the tempo:
You can also send a customized message, either a one-shot message, or you can set up a message then send it over and over whenever you want (eg: "Tip your waitress!" or "Drink Specials for the next hour!"). To show a one-shot message, pick Video->Messenger Message, then type your message and it will immediately be shown. Alternately, you can pick "Video->Enter Custom Messenger Message" to enter a message that will be saved for later. Then, at any time you can pick "Video->Show Custom Messenger Message" to show that message.
Eventually the messenger will be able to show the (independent) volume levels of the microphone(s) and the music.