Let me first say that I'm not a guitar player but according to wikipedia you will see that Satchel use very few stomp box.
As a strating point have a look there:
http://en.wikipedia.org/wiki/Russ_Parrish
I then suggest to find out if this is exact. The idea is that once you know what he's using to produce that sound it's much easier to replicate it…
Just my $0.02
LA
