Whatever the source of her repulsive tone when she is excited, angry, and emphatic, she would be wise to stay calm and speak in a soft tone of voice, letting the microphones and speakers to the work of amplification.
(But I hope she keeps on screeching in her unpleasant grating voice)
Hillary is just repulsive in general. I’ve despised her since the first time I ever saw her, and didn’t even know her name...I had to look at the caption below the picture to find out who she was just after I thought...this woman is EVIL...