We're designing a web presentation for a client, and the subject of including "white noise" background audio (crowds etc) after a video has finished to enrich the presentation and tie the different elements together has been discussed. This will only be triggered when the user starts the presentation, and there will be an option to mute the audio throughout.
My question is, is this acceptable? Will background noise used in this way annoy users?
Any advice would be appreciated here, I can't find much about using audio on websites in this context. It would also be a huge benefit if anyone can suggest links/articles that support their case one way or the other.