Here's the multi-amp simulating board i've been working on. There's a few other effects too, but these are the key pieces.
The signal goes from the Punch factory to the fuzz (and some other un-shown effects) to the BDDI. Its output is split in 2 by LS-2 #1 which is set to A+B mix. One signal goes to the input of LS-2 #2 and one goes to its recieve A. The Parallel out of the BDDI goes into the GT-2. The GT-2 signal goes into the the LS-2 #2 recieve B. The LS-2 #2 is set to A+B mix also.
Both LS-2's act as ON/OFFs for the 2 Sansamp Pedals- they are muted when off. #1 that controls the BDDI is usually always on. When I kick in #2, the GT-2's Marshal Tone is released, mixed with the BDDI's sound, simmulating a bass and guitar amp together! The reason I needed 2 LS-2's is that when the GT-2 is mixed with the BDDI, it steals some of its volume, wich is percieved as a drop in low end. So the LS-2#2 had to be mixed with more of the BBDI's volume to compensate.
The bass fuzz before these "amps" lets me use it with either or both at the same time.
I thought this might be helpful to someone struggling over how to attain MONSTER TONE!
Also, I run it into a SVT-4, and that helps too.
here is the link to some audio:
http://soundclick.com/share?songid=7226948