Demystifying Piano Tone
Piano pedals - Wikipedia
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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
Crescendo pedal - Wikipedia
Pedal clavichord - Wikiwand