Bough a CTK7300IN last year in may. It was my best purchase decision. I started using it for some usual live performances. It was working fine, there wasnt't any complain until this september. I was using it at my teacher's day performance at school. Suddenly the mic started giving wierd sounds so i switched the mic off. Moments later same sounds started coming from my keyboard's speaker. After that i switched it off and then back on. After the performance was over checked it the piano tone was like some what changed. Now, the piano sound of CTK3200 sound better to me than the CTK7300IN. What should i do. Tommorow I have a competition and playing the song on piano tone. Can someone help me out with it? Or send me a better piano tone. Need it fast. Please help.