The Difference Between Tone and Vowel Quality in Tonal Languages

If a language is tonal the whistles will represent the tone they will stand in for the F zero frequency right? Yes. Whereas for non tonal languages they are representing vowel quality. So if the language has lexical tone then the the whistled form will follow the tones primarily and just throw out vowel quality completely. But it's not just a split between following F zero versus following a higher formant. The tone takes really takes center stage.