<prompt> Qedela umusho olandelayo: Ngezinye izikhathi ama-clapper anezikhwama zesikhumba ezibizwa ngokuthi ama-muffle ezifakwe kuwo ukuze zithulise izinsimbi lapho ziprakthiza ukukhala ukuze zingaphazamisi omakhelwane. Futhi emingcwabeni, ama-half-muffles avame ukusetshenziselwa ukunikeza umsindo ovulekile ngokuphelele emjikelezweni owodwa, futhi umsindo ocushiwe emjikelezweni ohlukile umphumela ohlukile, wokulila. Lokhu kwenziwa  <response>: Umngcwabo kaDiana, iNkosikazi yaseWales ngo-1997. 