Right you are Mr Silvertones. I didn't even SEE the "set key/transpose" button the first time I used BIAB. It works C=C if it is set to C and you programmed the song in C. But if it is set to C and you write the song with the A family chords, you then need to do "transposing math" when you want to move it. Sounds like from his last response he has it together now.