Due to the inclusion of inappropriate sounds in all sound web sites I've seen, I do not have a link of sound effects for students to browse through as I do for music. Students can also use a microphone to create their own sound effects. Again, teachers should decide in advance how much time to allocate to this activity. Due to the need for complete silence, the recording session usually has to be the same period for everybody in the class. The students take turns using the microphones.
Video also adds fascination to a presentation.
Video clips can be downloaded or student created video can be added. If students create their own clips, they must be encouraged to keep the time to 5 seconds or below as the file sizes can become enormous. Buttons add a fascination for the viewer. If free access to the total presentation is granted by generous application of buttons, the viewer becomes engaged in a learning experience. Students should be encouraged to explore interactive presentations.