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The calming remote is no longer used on Deatholof, but rather, Monty Monitor. Using the Calming Remote causes Monty's Monitor to stop beeping from anywhere in the school.

I may be late to reply here, but that's because you have Ralzine enabled. The bug is caused by Deatholof being linked to Ralzine's toggle, meaning if Ralzine is on, Deatholof will also be on, and if Ralzine is off, Deatholof will also be disabled. I hope this answers your question.