Thanks for all your help, that got me looking and now I understand a little more about sound tweaking!
Yes, definitely don't need both the filter settings and the phaser, but it adds a little shimmer on the top, which is quite nice. (Similarly for Resonance - not sure if it was used originally, but it adds a nice bite to the effect.) However, after getting the sound working well with an auto-wah style effect and playing along with the original, I'm pretty sure the original part was modulated manually, using a mod-wheel. Although the variations in tone/wah are fairly regular, there's too many little variations and imperfections to have been an automatic effect. Not really fussed, mine sounds close enough to be usable!
Will post up the current setting tonight, I'm at work right now.
Cheers,
EG