Some scholars postulate that Proto-Afroasiatic may have had tone, while others believe it arose later from a pitch accent.
sˌʌm skˈɑːlɚz pˈɔstʃʊlˌeɪt ðæt pɹˈoʊɾoʊˌæfɹoʊˌeɪsɪˈæɾɪk mˌeɪhɐv hæd tˈoʊn, wˌaɪl ˈʌðɚz bᵻlˈiːv ɪɾ ɚɹˈoʊz lˈeɪɾɚ fɹʌm ɐ pˈɪtʃ ˈæksənt.