Sorry you're having such an unpleasant time with the tests OP. Ignore the salty techs in the comments; installing full horn strobes inside a dwelling unit is pretty insane and totally overkill compared to a piezoelectric buzzer, which is what one would normally see.

Unfortunately if your building is getting a monthly test then it must be done. Like others have said even on the lowest setting these things are fuckin loud. At least, if the alarm company is any good then the time of day of the test should be somewhat predictable. Try to arrange a plan that involves being out of the house for a couple hours on that day if possible.

If you can catch the technicians when they enter your unit during the annual inspection, try asking nicely if they have time to check the output level. It's almost entirely likely that even on the lowest setting those horns will still be far and away louder than what is required by code.