I am talking about controlling the Audya from the Tyros (or others), not Tyros from Audya.
Yes Start and Stop is working with standard midi cables, but then, the 2 arrangers don't play in sync if you use audio styles.
The goal of this syncro features is that if you change tempo on the tyros, then the same changes are made on the Audya, and the styles stay playing together, even after 1 hour.