Let me explain this as clearly as I can. I have both the A2000 and the 650 in my store and this question comes up alot.
Right now you can only load one package at a time........But, the people that program for Yamaha have already combined 4 packages together to create 1 64MB or 1 16MB package that they are giving away free of charge that both have a mix of the Oriental, Latin, Celtic and Baltic packages. I have a very close friend who works for Yamaha and he is working on a Iranian/Armenian package and he says that eventually Yamaha will surely make the software available that will allow customers to create their own packages.
I hope this is clear.