Korg Poly800/EX800 Users

Hi,

I have just purchased a Poly 800-II.  It didn't have a manual (But I 
hope to have one very soon), but I have managed to get a very small 
manual for the original poly.

I got it today, and set it all up to the PC, However, It sounds 
Terrible.  Lots of 'Hiss/Feedback/duff notes.
There doesn't seem to be much wrong with oit itself, I think it just 
needs the sounds setting up correctly.

Any advice ?  How do I get the synth to go back to it;s default 
settings ?

Any help will be more than welcome.

Regards

Kenny