In the first third of the nineteenth century, Sordino used to be a standard feature on all grands made e. g. by the piano companies Graf (Vienna) and Erard (Paris).
Thanks to a suggestion from the pianist Jura Margulis, Steingraeber has now reintroduced this feature as pedal* or knee lever.
A very fine piece of felt goes horizontally between the hammers and strings, allowing thus tone colourations/modifications as it is required e. g. by Franz Schubert’s “fp” marking.
* optional 4th pedal or by switch interchanging with the sostenuto function.
Exhibitor: Steingraeber & Söhne KG