Dweezil's rig - signal path?

[stompbox steve]

Hello People

I saw in the Sept 2008 Guitar World, a detailed run down of Dweezil Zappa's pedal board.
Have you guys seen a signal path flow chart? Like the ones they do in the back of the magazines. It shows what is connected to what.

Besides the general interest, I am trying to figure out where he keeps his volume pedal in the sigal path (and not the location of the pedal on the board (between the wah and EB)).

To boil it down further: Inline between the guitar and amp or in the effects loop.

I am curious what the pros are doing, especially with his killer sound.
Thanks, Steve