Trumpet mute help
I got a straight trumpet mute for my school-aged child's school-issued trumpet but it isn't working as expected- the sound is louder! I don't want to use too much force so I think it is technique for use that is failing. It seems like something that would be straightforward to use so I wasn't bothered that there weren't any instructions in the box.
In the event this one just doesn't work out to dampen the volume, does anyone have any recommendations for a particular brand and model for a school-issued trumpet mute, one that is affordable? Apartment living isn't conducive to practicing. We got a Protec ML100 which was $22 on Amazon.
Any guidance is appreciated!