This example uses YUI to handle common DOM events such as clicks, scrolling and key presses on form elements and makes calls to SoundManager 2 (JS + Flash Sound API) which handles the sound effects. YUI's drag/drop library and slider widget are also shown. Interacting with the widgets on the page will trigger different sounds.
Things to try:
Note that this is a silly/fun example and is not recommended for practical use, unless you're building a web site for kids or something like that. ;)
HTML 5 should ultimately eliminate the reliance on Flash for audio embedding like this, and simplify the work to an <audio> element in the future.
Related YUI + SM2 demo: Play MP3 Links Inline
This page is a demo from a YUI Blog article on YUI + SoundManager 2.