Can you enumerate what changes or what are those CS1X users' demands that Yamaha responded to? If I can just get those additional sounds of CS2X and converted it to CS1x and be able to play them, then what's the use of having this CS2x while the only main difference is the polyphony. I really don't need 64 notes in my applications. I just want to know if getting the CS2X is really worth the amount of their difference since I already have a pretty similar machine. In other words, what are the things that I can do with CS2X but not with CS1X other than using another 32 notes. I do mostly live performances. My other concern is the store that I bought my CS1X does not want to give me a full refund since I bought this like a month ago. Hey, thanks for your response.