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I don't think it can be easily changed in the Minitor 1 but you can fix the alert tone to be independent of the volume control. It takes removal of a small jumper and installation of about 2" of wire to do.
There is a way to fix the Alert tone on the Minitor Pagers to be a continous tone, such as the tone heard when decoding a Group Call. I dont recall the exact modifications, but it can be done.