My Legacy 800 mute switch is electronically silent - I can only hear the sound of a physical click when I switch it.My next gripe is the mute switch. It's noisy and makes a loud pop when engaged or disengaged.
There shouldn't be EQ or functional differences, I'm 99% sure that it *is* the exact same preamp board (and mute switch) whether you're talking Legacy 500, 800, or 1200.
I demo'ed a 1200 and it sounded and functioned identically to my 800.