On December 7, 1998, a format swap occurred between XHFO and XEQR-FM, with XHFO adopting the English classic hits format "Universal Stereo" that had begun in 1974, whereas "La Z" moved to XEQR.
ˌɔn dᵻsˈɛmbɚ sˈɛvən, nˈaɪntiːnhˈʌndɹɪd nˈaɪnti ˈeɪt, ɐ fˈɔːɹmæt swˈɑːp əkˈɜːd bᵻtwˌiːn ˌɛksˌeɪtʃˌɛfˈoʊ ænd zˈɛkɚɹˌɛfˈɛm, wɪð ˌɛksˌeɪtʃˌɛfˈoʊ ɐdˈɑːptɪŋ ðɪ ˈɪŋɡlɪʃ klˈæsɪk hˈɪts fˈɔːɹmæt "jˌuːnɪvˈɜːsəl stˈɛɹɪˌoʊ" ðæt hæd bɪɡˈʌn ɪn nˈaɪntiːnhˈʌndɹɪd sˈɛvənti fˈoːɹ, wˈɛɹæz "lˌæ zˈiː" mˈuːvd tə zˈɛkɚ.