Wow, this is a music revolution! I used to be a Roland and Korg fan, now Yamaha is nr1 for me and that's because Yamaha seems to know what keyboardists/arrangers want. This peace of gear is extremely fun to tweak with! The sounds are really good and it is a very good and high quality product! What I like the most is the voices and effects in it. Therefore I wish I could load it with more voice samples, that is the only thing I miss about this keyboard. I like editing sounds with it. The song editor is nothing too exciting but no problems, it is equipped with 128 note polyphony, USB and 32 MIDI channels! This is the ultimate product for arrangers and live keyboardists, the price tag is too low in my opinion! I'm EXTREMELY satisfied with it!