Praise be to the Circuit City's and Wal-Mart's of the world as Guitar Hero II for the Xbox 360 has arrived a few, scant days early on Mount Joystiq. What? You actually go to a game store to buy your games? You should probably stop doing that. After shredding it up like only nerds with tiny, plastic toy guitars can, we actually took a look at the instruction manual, curious as to any information regarding the mystery port found at the base of the X-Plorer.
The gods of rock shined upon us as it is now clearly labeled the Effects Pedal port, as seen above. Opposite the page is an explanation of all the buttons and gadgets found on the guitar, including an explanation of the Effects Pedal port. How dost thou rocketh mighty ports of pedals?
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Rockin'! Now that we know for sure that it's for some sort of effects pedal, we curl up into the fetal position. We've been scorned in the past by these sorts of shenanigans. We're looking at you, Konami! We still want our Beatmania III pedal!
(Update - Because everyone is insane and paranoid about April Fools, we've included some actual pictures of the manual in question behind the cut. We even threw in some Mudkip because we heard that you like him so much.)