Compression of audio files

I tried using the Audio compression for WAV files in a course I was giving. One issue I am noticing with this is that the WAV files in the course or set to invisible, but when they are converted to FLV they show up with a display bar. Is there any way to hide this?I tried using the Audio compression for WAV files in a course I was giving. One issue I am noticing with this is that the WAV files in the course or set to invisible, but when they are converted to FLV they show up with a display bar. Is there any way to hide this?

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