However one wants to play is OK by me. Who was the songwriter, Irving Berlin?, who only played in F#, but had a lever that would transpose for him? The kind of transpose button I thought the thread was about would let you "play" in one key, but sound in another. Like the singer used to sing in C but now the singer has a cold and wants it 1/2 step down. She wants to sing in B. My 61-key board will shift octaves up and down. A transpose button will let you finger/play in the key you're used to, but will sound in some other key. I play only keyboard sounds, piano, rhodes, wurli, clav, organ. If there are brass and woodwind parts we call the union. I suspend disbelief, and pretend I'm playing a real piano.