Mp3 Stereo - E-stim Sound Files Stereo allow for "interplay" between different areas of the body, creating sensations that feel like they are circling, pulsing, or alternating in ways that a simple monophonic device cannot replicate. Why Use MP3 Format? The Ultimate Guide to MP3 Stereo E-Stim Sound Files: Safety, Setup, and Smoothness mp3 stereo e-stim sound files