When if comes to Harlowe 3.x and all things Audio the general advise is to add Chapel’s Harlowe Audio Library (HAL) addon to your project, and to use its features and custom macros.
warning: The Passage Editor Extension supplied by the Harlowe 3.x Story Format only knows about Harlowe’s own core/built-in macros. So its syntax highlighter will display a warning when it encounters any custom third-party macro usage in a Passage, even when that custom macro is actually available for use.