In this week Premier Guitar showed the Steve Morse's Rig and it's pretty much straight foward: Ernie Ball Music Man axes and Engl Amps. This minimalist rig is the key for his great and punchy guitar sounds, showing that "less is more".
Ernie Ball Music Man "Steve Morse Frankenstein" with HSSH pickup configuration
Ernie Ball Music Man SM-Y2D
Ernie Ball Super Slinkys (.009–.042) and uses .011s on guitars tuned to dropped-D
The Steve Morse Signature Special is a 100-watt Engl head
6 Engl cabinets with Celestion Vintage 30 speakers
TC Electronic G-Major 2
TC Electronic Hall of Fame Reverb
TC Electronic Flashback Delay
TC Electronic Polytune 2
Keeley Compressor for quirky Ritchie Blackmore tone.
Ernie Ball VP Jr. volume pedals
For more in-depth information: http://www.premierguitar.com/articles/22983-rig-rundown-deep-purples-steve-morse