I have few questions about S-900,please clarify.

1.How is the Strings section when compared to Tyros2? Is there any improvement in strings voices?
2.What improvement in S-900 regarding vocal harmony feature overpsr-3000 and how the microphone sounds in s-900?
3.How the Aux output sound with connected amplispeaker system?Is it sounds better than psr-3000 Aux output?
4.Is the styles sound same as Tyros2?
5.What is the difference between PA-300 and PA-300B power adaptors?
6.Your S-900 keyboard manufacturing country.

SUNNY.