Comment: This success criterion should be Level 1 because, for example, if it isn't satisfied and background audio interferes screen readers, information could not be conveyed. Also, even if a mechanism to turn off background audio is provided, some users could not find the mechanism because of its background audio, so it would be better that the success criterion itself was reconsidered.
Move this success criterion to level 1. And possibly restates the criterion such that "do not play background audio without user request.
Because automatic audio can interfere with assistive technology, SC 1.4.1 (formerly 1.4.2) has been moved to level A.