Need help with the 4:1 Compressor

[Ariosto]

Hi everyone,
I need to know where to solder the "G", "L", "I" and "O" cables in the Four One Compressor. I can easily assume that they are Ground, Input and Output, but still not sure about "L" (Line?). The PDF does not help too much, or my knowledge is insufficient. Please write me to:
cristian_fe@yahoo.it
Thanks in advance! Greetings from Germany!
Ariosto

[bsoncini]

L IS for led. You solder that wire to the 3pdt so that the led turns off with the effect.

[madbean]

http://www.madbeanpedals.com/tutorials/downloads/1590G_BuildGuide.pdf
http://www.madbeanpedals.com/tutorials/downloads/MBP_FootswitchWiring.pdf