You're correct about it being the CS-80. I just can't find my UK/UK CD to answer the rest of your question. If memory serves me correctly, that passage has a sound reminiscent of one of the Funky presets...the way the envelope opens after a key is held down reinforces my thinking it's one of those, but then when he does the descending scale run before Wetton sings again it sounds like a different patch. That is a beautiful etheric part, and it's a rephrasing of the descending run at the end of Presto Vivace. It could be a sound he designed.
Sorry I can't help you further :roll:. Maybe when I locate my CD, I'll get back to you on this.
ROCS-80