Final answer:
The critique addresses the vocal pitch quality of your speech. It suggests that your pitch was too high and shrill, which could be adjusted by using pitch modulation techniques to better engage your audience.
Step-by-step explanation:
The critique on your voice by your professor pertains to your vocal pitch, which is the highness or lowness of a speaker's voice heard by listeners. While your pitch is unique, there are techniques to modulate it effectively to avoid it being too high-sounding and shrill, which can be off-putting or distracting to the audience. It's about finding the right balance and using pitch variation for emphasis and to communicate enthusiasm, or to signal transitions in your speech. For example, you might raise your pitch slightly to signal a question or lower it to convey seriousness or authority. Developing a comfortable pitch level that is natural yet dynamic is key to engaging your audience effectively during a speech.