In some Chadic and some Omotic languages every syllable has to have a tone, whereas in most Cushitic languages this is not the case.
ɪn sˌʌm tʃˈædɪk ænd sˌʌm ɑːmˈɑːɾɪk lˈæŋɡwɪdʒᵻz ˈɛvɹi sˈɪləbəl hɐz tə hæv ɐ tˈoʊn, wˈɛɹæz ɪn mˈoʊst kʊʃˈɪɾɪk lˈæŋɡwɪdʒᵻz ðɪs ɪz nˌɑːt ðə kˈeɪs.