I came across this website the other day and liked the idea of it. They give you code to insert in web pages of your choice on your website. When the page loads it plays a five second clip of sound advertising another website, product or company etc. The advert that is played is also related to the content of your website.
They claim that five seconds is long enough to leave an impression on the listener and say its short enough not to annoy them. However if you are browsing many pages of a website and they have implemented this on every page, it is more than likely going to become irritating.
This system is probably rendered useless if the user has their sound off lol.
You can view the website here whether you are interested as a publisher or an advertiser. There is more information on their website.
Selling Pay Per Play – Sign Up Here
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Very useful information to anyone who is interested in what is being described