Seamless sound switching. A real Sampler. USB 3.0 interface. Professional sounding Vocal Harmonizer. Full sized keys. Better action keybed. More internal memory e.g. 70MB or more. Better acoustic pianos. Better electric pianos. Better sounding Drum kits. Touch screen. Balanced outputs... hybrid jacks designed to take either XLR or TRS would be nice. SSD hard drive with streaming capability. MP3 compatibility, plus voice cancellation technology. 24/32 bit dacs. 256 note polyphony... it's high time someone raised the bar to the next level. FWIW, Roland recently accomplished that feat with the Jupiter-80, but it's NOT an arranger.

Instant record and playback of user's playing (30, 60, 90 etc... seconds worth) as featured on Roland TOTL workstations. I'm not sure if the Tyros4 currently has that ability, as I've been out of the loop for a while regarding arrangers. If it does, disregard. B3 tonewheel organ technology. Much more WAV ROM... 2GB or larger would be nice... which is still a pittance when compared to VSTi instrument sample libraries. Micro sound editing capability. Higher resolution LCD screen w/ ability to view in direct sunlight. Last but not least, (although more suggestions could be added upon further review) a 76 key option, which most likely Yamaha won't produce again until new executive leadership steps in who won't have any preconceived notions or personal reservations regarding Yamaha's previous business model decision i.e. the 9000PRO was an "experiment" never to be replicated while current Yamaha executives continue to rule the roost. Or so it seems. A new CEO may be necessary before we see a 76 key TOTL arranger from Yammie again. But here's to hoping the current CEO will have a change of heart and surprise everyone in the process. And I do mean everyone! lol

You da' man Steve! Although obviously Yamaha limits what, as well as when, you can post here on Synthzone. It's all good though. You'd likely post here more often if Yamaha didn't keep you on such a tight leash right? Ya' gotta do what the boss says. On the other hand, I would likely post here much more often too, if I actually owned an arranger. After I sold my Tyros and parted with my PSR2000 I've been arranger-less. I'm still waiting for a suitable 256 note polyphony arranger, which I imagine many other arranger keyboardists are waiting for with bated breath also.

128 note polyphony has been milked to death and a doubling of the current standard would go a long, long way in re-igniting much needed enthusiasm within the arranger keyboard market in my opinion. With all the new fangled additions being added to arrangers e.g. multipads, complex style arrangements, layered voices, etc., etc.,... it is relatively easy to exceed 128 note polyphony and experience the dreaded note cut-off(s), which can wreck havoc, especially during a live performance. I commend Yammie for seeking user input on future arranger possibilities. Roland and company have a terrible habit of excluding user input from the equation. The result, sadly, is the BK-5. That's my own personal observation and opinion obviously. The sounds on the BK-5 just didn't do it for me. Mind you, there are some pretty decent sounds on the BK-5 but it's hit and miss. More often miss, if you ask me. But at $999 it's a good choice for the beginner I suppose. But I digress. Keep up the good work Steve!