Step 1 - In Visual Composer page editor, click the Add Element button, then select the element Text Block.
Step 2 - Create an audio player with WonderPlugin Audio Player plugin, then add the player shortcode
Step 3 - Test the player in the published WordPress page or post
Update the page/post, visit your website and test the player in the published page/post. The player will not work inside the Visual Composer editor itself, both frontend and backend editors.