Hi @DarthKevin,
Welcome to the forum.
This is new to me.
I can tell you that after all this time, I memorised the sound of the X1C movements at the start and end of a print to the point I knew if something was wrong.
Yet, I never hear a beep. I doubt there is a buzzer in the printer.
Regarding Marlin g-code and BL, you are correct regarding the flavour. The community already made a database of relevant info: Bambu Lab X1 Specific G-Code