don't just "Stop" the audio. Even if you want it to instantly stop do a tiny fade-out. Use the Fade Action. Even a 0.5 second fade is fine. Otherwise if you just stop it, it can produce an unwanted 'pop' sound. In the long run it makes a big difference because there could be many times in your game where you stop audio and all those pops add-up to giving the player a feeling like the game is unstable or glitchy.