After having the Tyros4 for a few months now, I'd say the only thing I would want changed (but it can easily be worked around with a foot-switch) is the DSP-Variation switch moved to the lower left hand side of the keyboard.

So far, all I have seen is improvements over previous models. Much, much better Vocal Harmony, sweeter and more detailed overall sound, an even easier to use Audio Recorder, improved Multi-Pad control.

I've never had the need to play style, SMF and MP3 simultaneously, but that's not to say it isn't important to someone else.

Another disappointment were some of the new SA Strings voices, although, again, I have found a way around that, and actually many of the new SA string voices are very nice combined with the older Live! Strings.

Also, I find the memory expansion to be quite expensive.

No arranger is perfect, but I have to say, the Tyros4 is probably closer than any other I've played.

Ian