[sdiy] VF-1

[Moho Disco]

So I have this Boss VF-1 digital fx processor.
It has a stereo pair of inputs on the back, and
a high impedance guitar input on the front. When
I plug my guitar into the front input, one of the
rear inputs is disengaged.  

This really bugs me out, I want all 3 inputs to
run through at once.

Now, I have plugged my guitar into the rear 
inputs and I don't think it sounds any different
than plugging it into the front.  So without the
aid of schematics, would you guys think that
modifying this thing to accept all 3 inputs at
once would be an easy task?

In the meantime, I will try and find a schematic
so a more informed answer can be given...

Thanks,

Lava