Originally Posted by BDB
A sostenuto pedals holds the dampers on the notes which are depressed when the pedal is engaged, until the pedal is released.


I know this much!!! I was trying to get a technical explanation (mechanical action, parts used, etc.)


tommytones
Mus. B., Classical Piano Performance
Kawai No. 600
Roland Digital Piano Model No. HP 147
Wurlitzer Electronic Piano Model No. 200A
Hammond M-3