👉 Cas sounds, also known as Casals sounds or Casals' consonants, are a set of consonant sounds used by the French-Flemish singer and linguist Édouard Casals, notable for their unique qualities and historical significance in phonetics. These sounds include the voiced velar nasal [ŋ], the palatal approximant [ɲ], and the alveolar nasal [ŋ], which contribute to the distinctive and expressive voice of Casals.