Graham's Live Rig (in his words):

When I play live, the core of my sound is my Mesa/Boogie Road King combo, where all the tones are created with the amp's four fully customizable channels.
I use a 3/4 back 212 extension cabinet when I need to move more air. My effects setup is really quite simple, but it gives me all the sounds that I need to do a show.

Before the amp in the signal chain, I have three pedals - a Dunlop Crybaby Volume/Wah, an Ibanez TS9DX Turbo Tube Screamer and a Boss CE5 Chorus. While I use the wah and volume functions once or twice in a set, the Dunlop pedal's primary function is as a way of muting my input signal between songs when I change guitars. The TS9DX is set with the distortion way down and the level at just above unity. I like the way this 'pushes' the front end of the amp a little, tightening up the sound and adding a creamy sustain. The chorus is mostly used for adding some depth and lushness to my clean tones.

From there it's in to the Road King, which has two switchable effects loops. In loop one is my main toy - the Digitech IPS33B harmonizer, which enables me to reproduce up to three part guitar harmonies onstage. The IPS33B also has great chorus, doubling and unison sounds, and has been in my rig since the unit was introduced as the IPS33 (an earlier model) in the mid to late eighties. Loop two has a Line6 Echo Park delay pedal running into a Boss GE7 graphic EQ. The GE7 allows me to change the level of the delay as well as enhancing some tones in the effect signal. The Line6 has a tap function that allows me to quickly match the delay time to song tempo. Both pedals sit on the top of my amp rig.

Between the Road King and the 3/4 back extension speaker cabinet is a Dunlop Talkbox, which I use for the first solo in the tune 'The Vowels Of The Earth', and a couple of ad lib spots during the gig where I may decide to throw it in. The extension cabinet sits on top of the Road King, putting the speakers a bit closer to ear level, and allowing the setup to easily roll on the combo's casters.

A simple, yet versatile and powerful rig that suits the tunes and my playing perfectly!
Check the diagram below for a basic outline of the rig.
 

Live rig diagram