I have just added a PA600 to my PA500, and am still lost when it comes to making FX adjustments. I have tried listening to the differences between '0' and 100% settings to get an idea of what can change, but there seem to be so many options, and obviously some would be inappropriate, but which ones, and why?
The Korg manual is thin on explanations, and assumes that I'm a musician, which I'm not.
Does anyone know of a book, or of on-line information on FX basics that I could use to lower the learning curve. I'm thinking that many sounds could be modified to add flavor to a performance, but I feel overwhelmed. Thanks for any help, David.

Don't know if it will help, but have you tried looking at the FULL User manual?
http://www.korgpa.com/images/stories/pdf/pa600/Pa600%20User%20Manual%20v100%20%28English%29.pdf

You also might get some help on the KORG Pa 600 User Forum
http://www.korgforums.com/forum/phpBB2/viewforum.php?f=64