Fred (dragon), I have found this YouTube video extolling the virtues of the Lowrey Rialto Organ .. which I know you have. It's about an hour long! I like the little 'Virtuoso Keyboard' up over the top where you can run your finger up its keys and it will play piano 'arpeggios' for you. What a novel idea! This is demonstrated from 45:14 onwards (drag the red dot along the progress bar until you get to this point).
Hugh