You'll need to use the Config.saves.onLoad callback. What you need to do within it depends on exactly which audio you wish to stop. You mentioned wanting to stop a playlist, but I'd suggest stopping all audio. For example:
Config.saves.onLoad = function () { $.wiki('<<masteraudio stop>>'); };
SEE: Config.saves.onLoad, $.wiki(), and <<masteraudio>>.
[EDIT] Updated to show the proper callback.