We have a waveshape demonstration exhibit where visitors can explore the shapes of sound.  The exhibit consists of a 503 Oscilloscope, a Rodgers Organ synthesizer, a tube Theremin, and a microphone.

With the Rodgers Organ synthesizer you can visualize the sounds of different acoustic and electric instruments and what makes them bright or soft sounding.  You can use the keyboard to visualize resulting waveshapes with different frequency content.  With the microphone you can make your own sounds and explore the waveshapes, or you can listen to the sounds different objects made when struck (we have a log which produces a very nice decaying sine shape when struck with a hammer).  The theremin is a great hands-free exhibit for looking at frequency and amplitude.

Come in and give it a try.