Mute button still doesn't work on the master fader

I assume this is a bug because there is a mute button on the master fader, but it (still) doesn't do anything.

Would love it if this were fixed! It's nice to be able to mute Musescore during note input and unmute during playback. Until the audio lag gets fixed and buffer sizes under 1024 are supported, this is pretty crucial to my workflow. Dealing with this much audio latency when using a MIDI controller is annoying, and having functional global mute would at least give me an easy way to ignore that.