Mute on Brass not triggering

You’ll need to provide more information and ideally a cut-down project with, say, just a few bars of music for the affected instrument, so we can see what’s going on. It’s not really productive to talk in terms of generalities when it comes to specific problems with playback techniques and expression maps.

A reminder for how to ask your question in a way that will help us to answer you most efficiently and get you back up and running as quickly as possible: