extent and longitudinal and lateral movements or displacements of the arm 27 which boundary restrictions cooperate with 1 the spacing of the detent teeth 26 longitudinally and 2 the displacement extents of the hub structure 22 relative to the hub receiving apertures 41 and contacts between the printed circuit board assemblies 20 a and 20 b and the terminals 34 38 laterally the first and second hub halves 24 and 25 are respectively rotatively and axially displaceable via said longitudinal and lateral positions as selected by the end user or musician the current conductive circuitry 42 is selectively engageable with the terminals 34 38 via the selected arm assembly positions for enabling signals to pass through select circuitry chosen by the end user the terminals 34 38 are preferably in electrical communication with a plurality of guitar based pickups as at 12 14 for directing signals from the guitar based pickups 12 14 through the terminals 34 38 and circuitry of the printed circuit board assemblies 20 a and 20 b for further signal output e g via amplification means 60 the switch assembly 10 according to the present invention thus enables a user to selectively alter signal outputs from guitar based pickups as at 12 14 by enabling the user to select.