Abstract: A device which attaches to the non-vibrating part of specific string(s) of suitable stringed musical instruments and which enables the musician to repeatably apply alternative predetermined tension states to the string(s), so as to selectively apply a known increment in pitch without the continual need for discerning re-tuning processes.

Abstract: A selector switch for musical instruments, such as electric guitars is provided having a single, manually operated toggle member adapted to perform greater functionality. A selector switch is disclosed which indexes longitudinally for the electrical connection of pickup(s) for resultant amplification but will additionally provide further associated connectivity by means of a transverse indexing motion thus availing expanded switching function from a single switch apparatus. This inventive step is referred to as a compound selector switch.