Sounds are all subjectable, but I find for me that Ketron has great musettes / accordions, saxes, brass family (trumpets, horns, etc) vibes, strings. Their guitars have improved greatly but not at the Yamaha level and their organs are very good, I personally prefer Yamaha's organs. Ketron always had great bread and butter sounds. I for one would take the saxes on Ketron over the Yamaha any day. But If you've owned Ketron before there is a improvement on the Audya, especially on the guitars.I think Ketron had so-so guitars in the past (x1,SD1,XD9) with the exception of the SD5, (it improved). Overall Ketron solo sounds were always good quality, (right down to the Ms Series) I find that other manufactures have stepped-up there quality in recent years.