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The Sostenuto Pedal
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The Piano Deconstructed
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Help with Sostenuto on 1887 Steinway Upright Model P - Piano World Piano & Digital Piano Forums
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File:Fortepian - schemat.svg - Wikimedia Commons
The Sostenuto Pedal
PS Upright Piano Action - for fastest repetition and sostenuto pedal
What Does The Middle Pedal On A Piano Do? – Dynamic Music Room
PS Upright Piano Action - for fastest repetition and sostenuto pedal
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Don't shoot the piano tuner....: Piano pedals (3) - the sostenuto pedal and the rest!
Piano Pedals – History of Piano Pedals | MaryO'Studio
Cincinnati Note: A New Pedaling Technique?
The Piano Deconstructed
Piano mechanism - lyre with three pedals from grand piano by Steinway: L to R: una corda (quiet) pedal; sostenuto pedal, holds notes played before pedal action but not those sounded afterwards;