OK - I've had more time with this beast and I'll share what I know so far.
1. I can use this on stage right now. I wasn't sure if I would be comfortable with no add-ons (harmonizer, etc), but I have determined that it's about 80% right ... right outta the box, so I'm giving it a whirl next weekend.
2. The Vocal Harmony2 is a huge improvement over past Yamaha offerings. It's way behind TC, but the cost factor offsets that ... just a bit. If I were still performing full time, I might not be willing to sacrifice quality and comfort, but for my new reduced schedule - it's really way better than I expected.
_a. The vocoder settings have been more humanized, and I like using the vocoderXG setting on my right hand .. as long as the octave shift is set to 1 lower, it compliments my voice pretty well, and lets me alter each tiny nuance of the chords in real time. I like that flexibility. The LH chords function won't follow as closely with certain passing tones. So, if I need a basic, easy harmony during style play - the LH chordal mode is fine, but if I go into Four Freshman mode and need more control, I switch to the vocoder mode, which, incidentally, will still play on the right hand even if the arranger is playing chords triggered from the left. I think that may be new - I don't remember using it like that before. Then again, I didn't like the quality of the vocoder in earlier models, so maby that's why I never gave it more than a quick trial. This one is not bad. Not amazing ... but certainly usable.
_b. As always, Yamaha has great effects and easy menus to edit and resave things, so it's a breeze to customize it to my needs.
_c. Don't get discouraged if the vocoder sounds weird - it's very particular to the RANGE of notes played. I tend to chord in the same 2 octaves alot, so I have a favorable note range for my voice - if you are into monster arpeggios and runs ... you need to shut off the harmony during that style of play.You could, of course, set the vocoder to follow your LEFT hand, and then you'd have the flexibility to voice exactly the chord you want to hear...if you can play like that. I can't - I have a simple workhorse for a left hand - basic chords and life-like bass lines.
3. The acoustic guitars are really a pleasure to play. I didn't expect to like them this much, but the playability is just wonderful.
4. The case shape/size is just a touch on the deep side, but it's still better than having to push my keyboard back another SIX inches for the sound bar. It sits well on my regular stand, and makes a nice impression.
5. BLACK. (what else do I have to say?)
6. Bang for the buck? I'd have to give it 2 thumbs up. For the market it's aimed at - it satisfies. Will it replace my PA3x? Nope - at least not for important control and recording settings. The Korg will now reside at home in the studio atop my cherished "Kentucky Rhodes" (the title of my next CD, for sure! Thanx again, Russ!)
7. The ability to turn off drum trax in a sequence and replace it with a pattern is interesting .... and useful sometimes. They took it one step further and gave 3 on/off buttons for drums, bass and chords of the smf playing, so you can "thin out" a sequence to give it a more intimate feeling. Nice feature.
8. Next to the 3x - what do I miss?
_a. chord sequencer (to be fair, we've done without it for a long time now, so it's not a deal breaker, but I DO miss it already)
_b. live sliders and drawbars ... better suited for studio work, as my left hand is always too busy to really benefit from these tools
_c. solid build quality - sexy design
_d. KEY FEEL (it's still a psr ... sigh)
_e. real time buttons for mic and harmony controls - the Korg shines here
_f. real time buttons for changing chord mode, quick mute of all arranger trax, and figured bass
9. Do all the above compromises justify a $2000 savings? Hmmm ..... I'll need more time to address that. I like pro gear, and I suppose the T4 is more of a direct comparison to the 3x, so I am not going to slam the board because of what it ISN'T. What it IS - is a fantastic sounding, lightweight workhorse with almost everything most performers will need to execute a show with some nice touches. I haven't tried the aux in with my iPad or guitar yet, so that review is still to come. Thanx for listening - hope you all enjoy yours as much as I hope to enjoy mine!