Oh shit, I hadn't noticed those.
I agree, they appear to serve no function. Here's a pic of some build notes that employ the order switcher:
"RED" & "BLUE" refer to the LED color, the LED being a two leg bi-color (note the feed from 50% Vcc, actual point is different because the blue is brighter than the red when fed the same, but anyway...
Gain 2 pre-out is treated as input and output is marked.