PSR S900 download capabilities

by Lachlan
(Newcastle, Australia)

Hello, I'm just wondering what the capabilities are for a PSR S900 as far as downloading voices, drum tracks, basslines, accompaniments and other loops. (excuse bad terminology)

Can it download and use them?

Where would a good place to find them on the internet be?

Do they have to be saved to a USB/external harddrive?

can the downloaded sounds be as advanced as the Live sweet or cool sounds onboard the keyboard?

Thanks for your time