Myself and Nedim both have the Kronos. I use the Kronos on Stage for weddings.

It is a breathtaking instrument, and I can do rudimentary arranging playing using both the Drums, Combinations, with/without Karma. Karma gives the Kronos lots of randomness you won't find in an arranger.

Go over to Korg or Karma-Labs and check it out.

It complements the Tyros 4 perfectly.