ɪt wʌz fˈɜːst mˈɑːɹkɪɾᵻd tə ɹˈeɪdɪˌoʊ stˈeɪʃənz ɪn nˈaɪntiːnhˈʌndɹɪd ˈeɪɾi sˈɪks ænd ɪz nˈaʊ jˈuːzd baɪ hˈʌndɹɪdz ʌv ɹˈeɪdɪˌoʊ stˈeɪʃənz ænd kˈeɪbəl sˈɪstəmz əkɹˌɑːs ðə juːnˈaɪɾᵻd stˈeɪts.
It was first marketed to radio stations in 1986 and is now used by hundreds of radio stations and cable systems across the United States.