Provided is an audio video synchronizing apparatus and method in a video processing equipment. The programming instructions are operable to receive one or more risk factors, receive one or more contexts, identify one or more context relationships and associate the one or more contexts with the one or more risk factors. All four sets of three signals are selected from the nine signals, and each set of three signals is composed of the central signal, and two neighbouring signals aligned with each other such that the central signal lies therebetween. The RO membrane is incorporated into a multi-cartridge unit adapted for facilitated slide-out removal and replacement as needed. Thus, a reference voltage value input to a first input of a comparator of the APC circuit can be determined on a basis of a specific condition when a ramping voltage value input to a second input of the comparator is substantially equal to a sum of a predetermined reference voltage value and the voltage value of the pad. For example, a first virtual device and a second virtual device may be configured to use the same physical port.