In my vocabulary, you mean the sound, not the tone
Tone is something you can't really achieve with effects imo.
Oh, but Gilmour's tone is unachievable anyway!
Right I'm gonna try get this fucker started again
I played it sloppily, it's recorded on a mobile phone and my guitar is almost definately out of tune (can't find my alen key ) but whatever, it's an easy riff that I'm 100% sure people will know.
http://s205.photobucket.com/albums/bb309/Manoswabs/Guitar/?action=view¤t=GuiTarriffgame.flv