thank you george and everybody else! for me a difference in price is important and unfortunatelly, i couldn't spend to much on this arranger i plan to buy, otherwisw i'd buy a pa1x and that's end of the story. so, considering everything you said here and so much other research i've done, i believe i'll go for a PA50. always i thought korg was more professional in this area (arrangers) but i always liked yamaha;s better. the psr4000 was the keyboard of my dreams at that time and i would have given the world for it. but now i am looking for professional results, and indeed PA50 seems to me the best deal. tnx for ure advice again