/// <summary>
/// Text-to-speech.
/// </summary>
/// <param name="text">Text.</param>
/// <returns>Task.</returns>
public async Task Speak(string text)
{
_speechCancellationSource = new CancellationTokenSource();
var options = await SpeechController.GetSettings();
await TextToSpeech.SpeakAsync(text, options, _speechCancellationSource.Token);
}