Thread:Adespoton/@comment-36392680-20190527205808/@comment-24886041-20190527211319

I don't believe so; originally it was embedded in the ROM and controlled from the General Controls panel. You can extract it from the ROM images using a hex editor. Eventually, the System file added a patch so that you could load the sound from a snd resource in the System file, and then a Sound control panel was added to select between them.

Chooser has always been used for selecting what the serial ports on the Mac are used for.