alright guys, longtime lurker here.
Watching the live youtube glasto footage you can see Gillian playing an ARP Quadra, and the main synth line has that classic sound. later on (on one of the dvds) there is a version of it with a really thin sounding synth, definately not the same sound.
Do you think Procession was dropped when they stopped using the Quadra? Legend has it they were a bit temperamental. The sound was from the string synth section so potentially they could have used a Solina or an Odyssey (having had one or other of them during Joy Divison Closer, accounts vary)
Procession is one of my fave tracks, great sound, great lyrics. And I'd get myself (more) in debt to by a Quadra.
(btw string synths are more related to organs than synthesizers, its a divide down mechanism rather than VCOs, multiple copies of the same sound merged via chorus into the same mix. unlimited polyphony. interesting article on the ARP sound: http://www.marksmart.net/sounddesign/arpstrings/arpstrings.html and an article on the creator of the string synth: http://www.soundonsound.com/sos/feb07/articles/freemanstring.htm )