In addition to marking plurals via a number of affixes (with the suffixes -*uu/-*w and -*n(a) widely attested), several AA languages make use of internal vowel change (apophony) and/or insertion (epenthesis).
ɪn ɐdˈɪʃən tə mˈɑːɹkɪŋ plˈʊɹɹəlz vˈaɪəɹ ɐ nˈʌmbɚɹ ʌv ɐfˈɪksᵻz wɪððə sˈʌfɪksᵻz ˈæstɚɹˌɪsk ˈuː slˈæʃɐstɚɹˌɪsk dˈʌbəljˌuː ænd ˈæstɚɹˌɪsk ˈɛn ɐ wˈaɪdli ɐtˈɛstᵻd, sˈɛvɹəl ˌeɪˈeɪ lˈæŋɡwɪdʒᵻz mˌeɪk jˈuːs ʌv ɪntˈɜːnəl vˈaʊəl tʃˈeɪndʒ ɐpˈɑːfəni ænd slˈæʃ ɔːɹ ɪnsˈɜːʃən ˈɛpənθəsˌɪs.