Various animations are referenced by the activities manual. Here are direct links to them.

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Travelling Wave Functions Applet Pulse.html http://people.rit.edu/vwlsps/312_s03/Physlets/pulse.html

Travelling Wave Functions Applet Wave 1A.html http://people.rit.edu/vwlsps/312_s03/Physlets/Wave1A.html

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Travelling Wave Functions Applet Pulse.html http://people.rit.edu/vwlsps/312_s03/Physlets/pulse.html"

Page 235, also on page 237

Pulse Superposition Applet pulseSuperposition.html http://people.rit.edu/vwlsps/312_s03/Physlets/pulseSuperposn.html

Wave superposition Applet SinSuperposn.html http://people.rit.edu/vwlsps/312_s03/Physlets/SinSuperposn.html

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Phasors Applet phasor1.shtml http://vnatsci.ltu.edu/s_schneider/physlets/main/phasor1.shtml

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Beats Applet Beats.shtml http://vnatsci.ltu.edu/s_schneider/physlets/main/beats.shtml

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Touch Tone Pairs Applet Beats http://physics.info/beats/