Compression bitrate.

This value is in bits/second, e.g. 128000 would be 128 kbps.

	// Prints the bitrate of the imported audio files
	class BitrateLogger extends AssetPostprocessor {
	    function OnPreprocessAudio () {
	    	var audioImporter : AudioImporter = assetImporter;
	        Debug.Log(assetPath + " - " + audioImporter.compressionBitrate + " bits/second");
	    }
	}