Write three new instruments that you learned about in these units.

Unfortunately, I need more context to answer your question accurately. The prompt refers to «these units», but I don't have access to the content of those specific units. To provide a relevant answer, I need to know what material you've been studying.

However, I can give you a general example of three new instruments and some information about them. These instruments might or might not be discussed in «these units».

• Theremin: An electronic musical instrument controlled without physical contact by the player. The player adjusts the pitch and volume by moving their hands in the proximity of two antennas.
• Ondes Martenot: Another early electronic instrument, known for its unique, ethereal sound. It was used extensively in film scores and classical music.
• Stylophone: A miniature stylus-operated keyboard, popular for its portability and distinctive sound. It gained attention in pop music and is known for its quirky tone.

To get a more specific response, please provide the details or content of «these units.»