A switched reversing configuration control for string instruments connects to a pair of pickup sensors located on an electric string instrument for selectively electrically configuring the pickup sensors between (a) the pair of pickup sensors being coupled with like polarity in one of series or parallel with respect to a pair of output terminals, or (b) effectively coupling only one of the pair of pickup sensors to the output terminals, or (c) the pair of pickup sensors being coupled with opposing polarity in one of series or parallel with respect to the output terminals. An optional reverse polarity passive boost circuit is provided for increasing the output voltage coupled to the output terminals when the pickup sensors are coupled with opposing polarity as compared to the output voltage that would otherwise be provided absent the reverse polarity passive boost circuit.