The tolerance of Short-Open-Load and Short-Open-Load-Reflect VNA calibration for variability in probe position is improved by using load and short calibration structures having impedance elements with a length at least two times the probe contact pitch and a width at least two times the sum of the combined pitches of the probe contacts. The variable-length FIR filter includes a first fixed-length FIR filter configured to generate a first filtered signal based on a first digital audio signal, and a second fixed-length FIR filter configured to generate a second filtered signal based on the first digital audio signal. Objects representative of the selected devices are then entered into a design file, and the objects are associated with the device’s engineering andor procurement data. Also, processes for forming FET multiplexingdemultiplexing architectures are disclosed that use alignment-independent processing steps.