A method has been developed for the preparation of ceralure B1, a potent attractant for the Mediterranean fruit fly. The method and apparatus utilize a vacuum capability to pull waste material out of the conditioning pad and through the apertured conditioning disk to evacuate the apparatus through an outlet port, the apparatus may also include self-contained flushing means and a piezo-electric device for vibrating the pad conditioning apparatus. The method also includes providing options to facilitate acceptance of the purchase order. Difference image data is generated by calculating the difference between the enlarged image data and the smoothed image data. Local activation times are measured, and several multiple-channel configurations decrease measurement time, decrease the impact of signal degradation, and increase the amount of data generated during a procedure.