Here's the chart from the interview in July 2007 Bass Player. They show the Wal's XLR going to the Demeter preamp, and the Wal's 1/4" jack going to the pedal board. From the pedal board the signal is split (post effects, and he has a lot of them) to the RAT/EQ/GK rig with 4X12, and the other side is the clean amp send to the other GK with 8X10.
Link Removed
One thing I want to point out is that unlike a real Wal pickup, I'm going to allow for different combinations of coils, so you can switch between the humbucking and say a split configuration, for example.
That's the plan anyway.