Hello Kashif,
I would suggest that you check out the Korg forum. There are several discussions regarding the PA800 and eastern music. Couldn't help you with the S900, but I'm sure there is a forum somewhere that could provide you with the info you are seeking.
Ciao,
Jerry http://www.korgforums.com/forum/phpBB2/viewforum.php?f=50&sid=e788cf2889986400c62434c77d181e5c