What could be simpler!!!! Whereas all the other buttons have a "user friendly" function, it feels strange having the counter bass a third from the bass note. (The counterbass for C being E etc. Is it normal to to play Bass C, Chord C Counterbass E Chord C as a regular pattern? I do appreciate everybodies help here incidentally, you are all a great help (although a little modest if I may say so!)