First, I'm 72 years old and not great with any kind of technology. I recently purchased a CTK-2090. I have been able to somewhat play the melody with the right hand. But I cannot manage to play the chords with the left. I see that there is a way to change the left part of the keyboard to play Casio Chords, ie. pressing one key in order to play three notes which represent the chord. I like the tone 021, EP piano. Then I hold down button 11 and advance to C Chords. However, when I play the chord it sounds tinny, and not at all like the tone I selected. What am I doing wrong? And also, the normal chords are one thing, like C, but when I see Cm or C7, etc. I am totally confused. I know that all the information I need is contained in the User's Guide, but at my age it just isn't adding up for me. Any help would be greatly appreciated. Thanks.