Does Sound Object work in Flash 5 Player?

Hey, I’m trying to develop something for Flash 5 Player and nothing seems to work. Currently I’m having trouble with the following bit of AS which works fine if I export for Flash 6. But in Flash 5…no sound. Is there a specific way an mp3 needs to be encoded for Flash 5 or does it not even accept mp3s?

// sound object
jbsAudio = new Sound();
jbsAudio.loadSound("i/mix.mp3", true);

I’ve uploaded an fla so you can see. you’ll need to provide an mp3 and chuck it in a folder named ‘i’. I can’t figure out what the problem is. Thanks for your help.