Abstract: A method for changing each of and/or arranging the sequential order of audio effects circuit modules constructed to be received in any electronic system so predisposed, noiselessly, without the generation of spurious noise signals into the main signal path of the system, during performance and all stages of operation, maintaining, all the while, the uninterrupted flow of the main signal path through the system. The effects box described herein includes a main housing containing a main circuit apparatus, and having module-receiving recesses. Modules each have multiple module contact elements positioned to contact corresponding recess contact elements when the module is installed.