Amazon.com: DAOK 3-pedal for digital keyboard piano, Three foot pedal unit Compatible for Yamaha P125, P121, P515, P128, DGX670 Electric piano (Black) : Musical Instruments
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How does the Sostenuto (middle) pedal on a grand piano work? See the mechanism inside the piano: - YouTube
Piano middle pedal, and what three of them are about | Luxury Pianos Inc.