Disclosed is a method for playing an audio packet separately in a video CD and apparatus thereof enabling to play the audio packet stored in the video CD selectively as well an MPEG2-formated audio file. A feedback controller is then employed to control the flow of bodily fluid sample through the microfluidic system based on the electrical characteristic measured by the meter. It can be manipulated for the purpose of storage or replay. A method for concurrent filling of more than one car, tank or container with gasoline or other liquid petroleum products, comprising the steps of:.