Thanks a lot George for the info about PSR2000! And thanks AJ and Gaurdman for suggestions.
As for PA80 fill-ins I totally agree with AJ and Gaurdman. Not just the fill-ins sound like another band, the way the fill-in buttons respond is also odd. Also when you change a voice most of the time the previous voice stops immediately. I would not talk about this much as this thread is not about PA80. If I knew these, I wouldn't have bought a PA80.
Thanks a lot again for all who responded.
Shiral