Thanks for your reply. I haven't bought the TY4 yet but will buy an arranger very soon. I am considering also the Korg pa3xpro when it comes out mainly because it has 76 keys, they claim its sound has been improved, and I have the impression (rightly or wrongly) that it's library of sounds and rhythms is more modern and not so much traditional. When I ready about the possible Tyros polyphony issue online it made me think twice. I thought that it might be possible because (based on my past experience with their YPG series) their auto-accompaniment feature at times is quite complex and rich with very full backing band instruments. So I thought that the auto-accompaniment might eat up so much polyphony that there would be just enough left for one finger right hand playing, whereas I tend to play block chords with my right hand. So thanks for letting me know that you haven't had any problems. I hope I'll here feedback from some more TY owners.