My microwave oven makes not 1, not 2, not 3, ... but 6 beeps when it's done. I hated the thing. No way to disable it. So I ended up opening the damn thing, find the tiny speaker and unsolder its wires ([1], [2])

My Instant Pot does the same thing, but I only use it in the evening, so not so much of a big deal as the microwave oven.

[1] Before: https://i.imgur.com/xuyQJwL.jpg

[2] After: https://i.imgur.com/ZwX8zWs.jpg