An invention is disclosed whereby an analog audio signal are transmitted over distances through a flexible medium using electro-optical radiation as the carrier of the audio signal. The analog audio signal is never converted into a digital mode nor is the signal ever filtered. The resultant analog sound that is delivered to the opposite end of the flexible medium is 100% modulated with a de minimus amount of signal loss due to noise. Though the best mode of this invention is it's application to guitar cords, any form of audio analog input will function within this invention, whereby a bundle of fiber optic cables that are capable of a high amount reflectivity, with or without the presence of an element that increases or facilitates luminescence, will become saturated with light which varies in intensity with the amplitude of the sound. This invention concedes that safety is a predominant factor when associating electrical energy with those products that people can be in contact therewith. This invention uses both direct and alternating currents but does so at very low voltages. Accordingly, safety precautions for the user and for the equipment used therewith are of the utmost concern, and the circuitry designed facilitates those desires with multiple grounding means, blocking of spurious voltages, stray capacitance and electromagnetic fields and preventing induction caused by opposing voltages.