Choose Sex in Text to Speech

Different browsers output different sexes in text to speech, some male some female. Same code. I would like to know how to choose the sex of the voice, please. speech.gender=”female”; does not work, some browsers it still comes out male.

Here is a list of language codes, []https://cloud.google.com/text-to-speech/docs/voices), but the voice names do not work such as en-US-Standard-F. en-US or lv-LV works though.

“`
function textToAudio() {

let speech = new SpeechSynthesisUtterance();

speech.lang = “en-US”;
//speech.gender=”female”;
speech.text = (“Hello”);
speech.volume = 1;
speech.rate = 1;
speech.pitch = 1;
window.speechSynthesis.speak(speech);
}
“`

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