A method and system for determining a mask for fabricating semiconductor device is described. The sparging device further includes a fluid chamber that defines a chamber area through which at least one of the sparger passages extends. The output of the power supply is modulated by a follower potentiometer coupled to a lever arm which resiliently bear against a segment of wire unwound from the supply spool in order to monitor its pulling tension. Various loudspeaker systems that are reconfigurable from directional mode, to omnidirectional mode are provided. A processor within the base unit compiles the physiologic and location data.