<http://schema.org/description>
"The issue of sound balance in any given broadcast is likely to divide opinion. In sports commentary for example, some may like their commentary as audible as possible, whilst others ..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/uk/2011/06/28/the-bbc-lets-online-wimbledon-listeners-control-the-sound-balance/>