The Appropriate Sound Effector (ASE) is a small, portable module to be attached to an existing acoustic instrument to modify its original sound, giving it an electronic timbre. It is composed of all of the basic components necessary for the generation of electronic sound and uses an open-source-based microcontroller in the module to maximize its expandability and for ease of future development. This project eventually showed a different possibility for appropriate technology when ASE is applied to musical applications.