"Vocal tracks" refers to the recorded sounds of a person singing or speaking in a song or music production. It specifically focuses on the part where the voice is heard. Full definition
Persona 5's soundtrack features a surprising number of vocal tracks with plenty of variation depending on the time of day or events going on. (wccftech.com)
As such, it will often be incumbent on you to provide vocal tracks, and a swing which is able to connect to your smart device will do just that. (babygearspecialist.com)
You can also change the character that is present on screen, though most of the time you will have the original vocal track regardless of the character. (nintendo-okie.com)