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These games allow students to interact with instruments and to see how loudness and pitch change. "Changing Sound" and "Pitch" links

Simulation to show changes in frequency and amplitude to help students grasp how loudness and pitch changes.

This free download uses the microphone in your computer (or you can use a plug in microphone for better quality) to detect sounds and instantly displays the sound waves on the screen. This would be a great tool to illustrate pitch and loudness, so they can make connections to the wave behavior. 

That is a great idea. I appreciate the fact that this is a truly interactive generic resource and can actually respond to stimuli in your room as opposed to being a detached simulation.

This is a short 3 minute video clip from Magic School Bus that really highlights loudness and pitch of sound