<prompt> Bhala okuqhubekayo kwalesi sigaba - Ngezinye izikhathi ama-clapper anezikhwama zesikhumba ezibizwa ngokuthi ama-muffles ezifakwe kuwo ukuze zithulise izinsimbi lapho ziprakthiza ukukhala ukugwema ukucasula omakhelwane. Futhi emingcwabeni, ama-half-muffles avame ukusetshenziselwa ukunikeza umsindo ovulekile ngokuphelele emjikelezweni owodwa, futhi umsindo ocushiwe emjikelezweni ohlukile umphumela ohlukile, wokulila. Lokhu kwenziwa emngcwabeni kaDiana, iNkosikazi yaseWales  <response>: ngo-1997, futhi 