Angular position sensing apparatuses and methods are disclosed. The method further includes reading addressing information from the mailpiece in the sorter, and comparing the addressing information with at least one do-not-mail list. A first clamp and a second clamp attached to the base allow the chord actuator to be attached to the neck of a guitar, wherein a plurality of actuators of the actuator assembly is positioned overtop each of the guitar strings. The optical element is made of a plastic material which is comparatively inexpensive.