Press TAP on the avatar of your teammate next to you. There is a speaker next to the piano girl. Click on it. If you are playing by yourself, press the Ctrl key and add 5 to switch forms. It is quite fun when it comes out. Bought it, good.

DJ Sona will have three forms, which can be changed by typing "/toggle" on the keyboard or pressing ctrl+5.

Each form has a unique musical experience that only she and her teammates can hear.

The experience is completely dynamic as the game progresses.