Mute lighting is too complicated. There, I said it.
Most of that likely comes from the implementation of Group Mute indication; flashing is a time honored tradition, but in my estimate, your cycle time is too long, and your duty cycle is backwards.
It’s probably easy to make those programmable, but I’d recommend 750ms and 90%, myself; the clip I saw suggests it would take me way too long to decide if a channel was muted in a live mix.
In a related story, does mute mute Pre-Fade mix sends, and did I just miss that in the manual?
That’s the semantic difference illustrated in LS9 buttons saying “On” rather than Mute. They actually do a different thing…