I also remember that the Lowrey organs had the foot switch, which they called the Glide Pedal. I hate to admit this, but I had an old Lowrey that I played in one of the first bands I was with. At the time, I couldn't play much of anything in certain keys. When the band played a song in "E", I would hold the footswitch over and play in "F". Could be the world's first transposer!
DonM