1. Put on audio headphones.
2. Click on each of the yellow circles to listen to sounds in various locations.
3. Adjust the default volume by dragging the Volume Slider handle to the right to increase the volume or to the left to decrease the volume.
4. Notice that a number from 0 to 10 appears next to the Volume Slider to indicate the volume level.
5. Click on the bottom right yellow circle. Notice that it is possible to switch to the bell attachment to hear low-pitched sounds.
6. Practice switching between the bell and diaphragm attachments to hear or filter low-pitched sounds.