Maybe the sounds can be switched off after all. See Youtube video: https://www.youtube.com/watch

It has beeps and no, according to the manual, they are not configurable.
Greetings

Yes, it is possible. To mute the sound on a Neochef microwave simply press the Inverter Cook and Stop/Cancel buttons simultaneously and hold for a few seconds - thereafter the word 'Off' will appear on your info screen. To enable the sound again, simply repeat the process.