The [url=http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=1148.msg4435#msg4435]original version[/url] was created to simulate a real device.

Please check out [url=http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=1148.msg5895#msg5895]New version of torsional wave[/url] if you want to simulatate the above demo.