## Lesson goal: Play a chirp

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A "chirp" in sound lingo is a sound that has a continually increasing frequency. As an example, suppose we started playing a 1000 Hz sound, then smoothly increase it to 1001, 1002, 1003, etc. What would it sound like?

We have a function called play_chirp() that allow you to generate a chirp.
play_chirp(start,end,duration,delay)