While my first guitar with an OBEL was nearing completion I got to talking to AO about cables and he mentioned the junction box. AO Guitars resides in Maine and I am just a couple hours away in Massachusetts. He sent me his prototype about 9-10 months ago. I belive this unit 001 as they say. You could email or call him. All the contact info is on his site. He is a real cool guy to talk too. He's also on the board.
This is just like any other junction box out there.
Line out to Amp - send return for effects- mono and sterio input for guitar. Has the added "Standard guitar" toggle which is a great feature if you want to use the effects with a standard guitar.