Thats not what i read...
The px-5s has all the pro features
The 560 has more home player features
This is what the px-5s offers above the px560, and what makes it the choice for people to use on stage..
4 Zones no rules: The PX-5S 4 Zones can overlap, be velocity switched or you could have 3 separate split points between the four zones. Turning zones on/off for layers is very easy but setting up split points does take a few more steps but it is much more flexible.
MIDI Control: The PX-5S is a full fledged controller that can send bank/program changes to external gear. Even the USB MIDI and Standard MIDI ports are independent – A Casio exclusive feature.
4 Knobs, 6 Sliders. The PX-5S has a many more front panel controls for real-time control over your sounds. The PX-560 only has 3 knobs.
DSP Effects: The PX-5S has the advantage here as each of your 4 parts (zones) have a DSP (insert) effect available. The PX-560 only allows 1 DSP effect for your 4 primary parts. An additional DSP effect is dedicated to an accompaniment part.
Stage Setting concept is unique to the PX-5S. It not only contains everything for each of your 4 zones but it contains the tones and everything that makes up this “Performance Ready” Stage Setting. That also makes them very easy to share with others. The PX-560 has “Registrations” which remember splits, layers and volumes but it simply references the locations of the tones used
4 Simultaneous Programmable Arpeggiators: We’re getting into an area that is far outside a traditional Stage Piano but this is an important design aspect of the PX-5S that can be used to create a variety of sounds and textures. There is a single preset arpeggiator on the PX-560.
Battery Powered: The PX-5S can run on AA batteries for about 4 hours. Think of it as having a built-in UPS power supply
Computer Editor: The PX-5S doesn’t have a touch screen but it does allow full editing from a computer. It is easy to set up your Stage Settings in advance of your performance.
The 560, has an arranger engine to compansate for the missing things from the px-5s. Indicating its more aimed at home players... pro musicians using arrangers are more rule then exceptions...
This makes the px-5s still top of the line...