Hal,

Here are my feelings on keyboard selection.....

Style Management
One of the first challenges with the Korg is the style/midi file management. All styles are part of what they call a .SET file a .SET file can have a 100 or so styles in it. If you want to copy a single Style off of the keyboard to the computer, work on it, and then send it back to the computer you can't; you must extract it out of the .SET file then use utility software to combine it with the set file and copy it back to the keyboard; WHY? Legacy, that's why and Korg refuses to update this legacy style management model. It is sooooo much easier on the Yamaha's. On the Yamaha you simply modify a single .sty file (midi file) and copy it back. Plus there are many 3rd party style management tools on the market to support Yamaha. The Korg .SET file type is a closed proprietary model and Korg will not allow 3rd party vendors create utilities to support their keyboards. Go figure?

Sounds
The bread and butter sounds in the Korg are nowhere near the quality of the Yamaha T4 sounds; period. Many of the sounds of the T4 are simply breathtaking. I do not get the same feeling from the Korg; actually I find some of the Korg sounds dated and synth-like.

Defined Nuance Control
Even their implementation of Super Articulation; Defined Nuance Control, does not come close to the coverage of the Yamaha's. There are so many more voices on the T4 that use this technique and I feel the technique is utilized better on the Yammy. The other manufacturers are playing catch-up.

Style Quality
No manufacturer has the depth and breadth of style variety than Yamaha. Not to mention quality, since the T4 was introduced they have released at least 25 new premium styles. You can't underestimate the importance of this as far as adding more value to the keyboard playability and gratification.

Not only are the styles-a-plenty, but the quality is second to none. Oh you may find a dozen or so styles on the Korg, Audya, Roland that will knock your socks off. But overall across all the genres, no one does a better job of coverage than Yamaha. And with the sliders and quick on/off buttons you can silence busy styles or turn on style parts to give the style that great full sound much easier.

Support
The Yamaha hardware is probably the most reliable on the market. combine that with the end-user support network of forums, style sites, psrworld, createsongstyles, Yamaha Keyboard site, etc.etc. it is the most widely supported keyboard on the market. Also, you can simply connect the T4 to the Internet and download Music Finder entries quickly and freely if you are wondering what song goes with what style. You can't do this with any other manufacturer. You can even download songs and lessons; right from the keyboard.

That is why the T4 is the most gratifying for me.......