An outside reader compared main.c with the 2.6.1 board netlist. Of seven signal paths, three have code, and the two VNA cases are empty even though the bridge, the AD8302 and the switch pins are all routed. A plug-in filter bank is "accounted for in hardware and no code path ever selects it." The maintainer said back in 2021 that most of his code isn't on main. #20 is a duplicate post.