Once you have sound on your site, think about how your reader is going to play it back. This is an effective technique for providing immediate blurbs of sound and instant effect. Think about where and how big the pop-up boxes, if any, will appear. Providing a pop-up box is a good idea since it allows your readers to have complete control over the sound. This can eliminate embarrassing situations at work, or prevent someone from leaving your site because they dislike the sound.
Many readers dislike having to go elsewhere to obtain a plug-in before they view a website.
When controlling sound on your page, remember to make the playing-back experience as simple as possible for your users.