Congratulations on your new acquisition, Tony, the PA-600 is an impressive keyboard, even if it isn't a TOTL instrument.
As with any arranger instrument, it will take time to get it to suit your style of playing, but, it also has some great features like being able to set itself up for each style you select, similar to Yamaha's One Touch Setting, and, of course, these presets can be used as the basis for your personal setups.
The Technics had you a bit spoiled, as it had a terrific User Interface, but you can bet the Korg will show it it's heels regarding cool new features that weren't even possible back when your Technics was introduced.
Happy playing,
Ian
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.