Hello,
i send an email to Rodrigo, this is his answer:
Hello Christian. The expansion pack has a cost of 5 dollars only, but If you have a Tyros or a PSR S and If you can please send me a high quality wav recording of the main demo song of one of these keyboards, I will give you the expansion pack for free. I really love Yamaha keyboards factory demo songs, I have the PSR S950, S970 and Tyros2 main factory demo songs. Have a nice day too!
Christian.