Ooh I almost forgot!
STABILITY. I had the Audya4 for 5 days and a the third day, it hangs with a very loud sound. Had to turn of. The nex days it worked ok
In 5 years using my Tyros2, NEVER failed. I think it says a lot...
I have to say that I owned a PA2X too. I liked the synth-workstation part of it, but as an arranger, sorry, not for me. The PA3X now have autofill and 4 fills which is closer to Yamaha and Ketron, but the overall sound I heard thru videos and mp3's seems so PA2X: too synthetic for my taste (for other music not synth based)
Well, it's just my opinion.
Thanks again!
Jose