How to do it...

Let's perform the following steps:

1. Run the following lines of code in the REPL. You should hear a beeping sound at a frequency of 900 Hz played for 0.2 seconds:

>>> from adafruit_circuitplayground.express import cpx
>>> cpx.play_tone(900, 0.2)

1. Execute the following code so that a lower frequency beep will be played for a longer duration:

>>> cpx.play_tone(500, 0.4)