The styles I heard in this demo were from the stock machine.
Assuming George is correct that the styles featured in the demo are all included on the 'stock' PA3X at his Southern California store, yet not on the one demoed at the Feedback Rotterham, Netherlands store,
I'm wondering now if perhaps the US version of the PA3X may include different 'stock' styles than the ones sold in Europe.
If I were to purchase a PA3X I would expect these 'essential' styles to be included as part of the stock keyboard, and not have to pay extra for them.
Clarification appreciated.