My set up is simple my friend, Guitar - TC Impact Twin - Presonus StudioLive (optional,i like the preamps) - Amplitube (in this case) with very simple but effective patch (compressor/amp & eq/Cab Sim with propper micing) - Waves Reverb - Compressor - Harmonic Exciter - Limiter :P
But most of the tone,if not all,comes from amplitube and the guitar,there are so much steps in recording audio that can influence your sound!
GS - Those were artificial harmonics,done 1 octave higher from what my left hand is playing :P