Use the tone bar and a triangle to demonstrate the differences in pitch. Amplitude is how high and low the wave moves from the middle. Amplitude determines loudness or softness. A soft noise has a small amplitude - it doesn't move very far up and down from the horizontal. A loud noise has a large amplitude - it moves from the horizontal.
Waveform refers to the shape of the wave and measures tone quality.
A pure note or tone will have a simple shape. A complicated chord or tone will have a complicated shape. Use the tone bar and a puili stick to show examples of simple and complex waves. Caution students are not to adjust the scope setting. They are calibrated for the best display.