I thought I might share this great news, I bought imidipatchbay ipad/iphone app, to try layering more zones with my px-560, and it works,
With one master sound and extra 4 more sounds total of 5 sounds / layers with splits and full controls of all other parameters on each sound.
You can connect your ipad or iphone direct to px-560 through camera kit adapter, it works and you can save your settings on your ipad/iphone for instant re-call
Knowing this fact and with imidipatchbay app, makes px-560 capable of doing 5 zones and makes px-560 more powerful than px-5s, but if you need master controller then px-5s the way to go.
Check it out http://www.imidipatchbay.com/