Halloween with sound

Author:
Arthur Lee
Happy Halloween
Click the Play button. This is second version of my Halloween file with sound effect. The wave functions s(x) ... are added to make the sound. Details are found from Malin's page: http://www.malinc.se/math/trigonometry/musicen.php Download the file, open the second graphic window to show and adjust the sound wave functions.

notes about making this file