/// <summary>
/// Error handler function
/// </summary>
/// <param name="e">The exception</param>
private void Error(GenericEventArgs <Exception> e)
{
this.OnError?.Invoke(this, e);
}
/// <summary>
/// Called when a TTS requst has been successfully completed and audio is available.
/// </summary>
private void AudioAvailable(GenericEventArgs <Stream> e)
{
this.OnAudioAvailable?.Invoke(this, e);
}