Filtration systems, methods andor apparatuses for use on a packer system are provided. The method comprises transforming a time domain input signal into a frequency domain signal in a digital form, processing the frequency domain signal and the input signal using at least two lower-performance data converters in order to obtain at least two processed signals, and recombining the at least two processed signals to obtain a final output signal from the high-performance converter. Dual stack capacitors comprising two dielectric layers may be provided to achieve low leakage and high capacitance. The present disclosure also provides a travel lock assembly, which partially connects the gun mount to the swing mount. The final settings and sources are used to perform marking and finishing operations, while the potential setting and sources comprise a pre-printing, job preparation history in the database. A call subject platform provides a selection menu to an originating device to receive call subject information.