Neither say there is a option to enable/disable the end of cycle buzzer.
You can contact Speed Queen at 800-552-5475 and ask them too if you want.
These Models only have a buzzer--->ADE4BRGS175TW01, ADE4BRGS176TW01, ADE4BRGS177TW01, ADG4BRGS115TW01, ADG4BRGS116TW01, ADG4BRGS117TW01, FDG4ZRGS115TW01, LDG4ZRGS115TW01, ZDE4BRGS175CW01, ZDE4BRGS176CW01, ZDE4BRGS177CW01, ZDG4BRGS115CW01 and ZDG4BRGS116CW01