Pedal keyboard - Wikipedia
How to Play the Piano (with Pictures) - wikiHow
Pump organ - Wikipedia
Yamaha CP-70, Genesis: a gear revelation Wiki
Hammond organ - Wikipedia
Crescendo pedal - Wikipedia
Digital Piano Conversion - The pedals are marked with D.R.G.M., which stands for Deutsches Reichs Gebrauchsmuster, which was a kind of patent light system used in Germany between 1891 and 1945. .org/wiki/Gebrauchsmuster
Box zithers: Bowed box zithers, Hammered box zithers, Piano, Pianist, Prepared piano, Hammered dulcimer, Alberti bass, Kantele, Player piano : Source: Wikipedia: : Libros
Pianoteq - Wikipedia