Thank you all for your help. And thank you, Chuck, for the very thorough explaination. I will certainly check out the sites you have recommended to me.

I went to a site called BluesBox Virtual Piano Chords. Visiting this site made question why C7 and C9 were the same. When I entered in C7 it displayed the notes I should play on the keyboard. I then changed to C9 and the keyboard stayed the same. It didn't change at all from C7 to C9, that's why I thought it was the same. I know about the chord finder on the KN6500. I just wasn't sure if Cadd9 was the same as C9.