Hi Chony,
maybe if you downloaded the sd1+ manual from the ketron site, it would give you an idea of the style creation functions on the Ketron.
Then when the Audya manual becomes available, you'd be able to do a bit of a comparison.

I persevered for over a year with the style creation functions. Unfortunately unlike Yamaha, there is no "Ketron" software available to create styles like there is for the psrs. I thought I'd use EMC ( with plus package) as a way to note event list edit the some of the styles, ran into problems with dissapearing controllers & other annoying problems.
Eventually gave up, bought a psr1500 & currently I'm playing around with the Korg PA800.
Still have the SD1+, beautiful keyboard, but didn't suit my style creation addiction haahaa

Apparently nedim ( Basari Studio's) over at the korg forum, has had access to an Audya,
maybe he can tell you a bit more.