Here's something for you. I downloaded the acid set from
http://www.xpjv.dircon.co.uk I have to say I never looked back after loading this into my XP60 (no cards). It's wonderful for all of those wah sounds.
As I said your XP60 needs no extra cards. The bank just get's loaded into the USER GROUP overwriting all that is there so backup your sounds 1st if you've created any.
It's definatley worth a try to experiment with this sound bank. If you don't like it you can just wipe it.
Have fun!!!!