Dave,
I had the SD7, SD90, and now a SD40. I was able to convert the styles from other Ketron products for my to play on them. Basically, the new products use the .KST format for styles.
If you try to load a Ketron style without the .KST format the keyboards usually would convert them to the .KST format. The Audya styles would not convert.

Deane