The Sostenuto Pedal

What is the sostenuto pedal and how to use it?

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Piano Pedals » What do they do and how to use them

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3-Pedal For Digital Keyboards Pianos,Three Foot Pedal Unit Compatible With Yamaha P125, P121, P515, DGX670 Electric Digital Pianos : Musical Instruments

How does the Sostenuto (middle) pedal on a grand piano work? See the mechanism inside the piano:

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The Sostenuto Pedal

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