Streaming flv audio

I have an flv file on the web that i need to stream from flash, and inside a class i have this code:

            var pStream:FLVPlayback = new FLVPlayback();
            pStream.addEventListener(VideoEvent.STATE_CHANGE, function(event){ trace("state change: " +; });
            pStream.source = sURL;

however, nothing plays (it’s not a video, it’s just an audio flv) and the only thing traced is “stage change: loading”

can anyone help?