Audio clips that have been uploaded to VITAL using either the Audio tool found under the Build Content menu in the Create column, or the embed audio facility of the Embedded Media function on the standard text editor, will begin playing as soon as the page on which they are held is viewed, whatever Autoplay setting you have chosen (yes or no). With multiple audio clips on one page this leads to cacophony.
This is a Known Issue for Blackboard, the developers, who are working on a solution but cannot provide a date when this will become available or a workaround for this bug.
This problem does not occur in Internet Explorer or Firefox (which is the preferred browser for VITAL) and so viewing VITAL in Firefox is the quickest recommended fix for this at the moment.
Another option is, where you own the copyright to the audio clips, to upload these to University's streaming media server Stream.liv.ac.uk and then link to these or embed them in VITAL content items.
If the items are available to stream from elsewhere on the web (YouTube for instance) then again, you can embed these in VITAL content items and avoid the problem.
1. Build Content - Audio item
2. Text Editor, Insert Embedded media - Embedded Audio option