I can see how that would be useful if you want your B rig to be on the whole time and not controlled by the Trem.The 4pdt is for the stereo operation. A 3pdt would only be stereo while the unit is working and mono only in bypass. Ask me how I know lol.
The board has a rate Led, but I don't like rate LEDs and always omit them. I can see how fast it's going based on the knob, and it's not like the led makes it easier to synch up timing. I hate the constant blinking.
I was just taking the piss. I remember you previously expressing your love for the "rate led" and I agree with you.