Estim (electrical stimulation) audio files are a specialized type of digital audio recording designed not primarily for listening, but for controlling electrostimulation devices. When played through a compatible power box or stereo stim unit, these files convert sound signals into variable electrical pulses that are delivered to the body via conductive electrodes. How Estim Audio Files Work Unlike standard music or spoken audio, estim files use specific waveforms, frequencies, and amplitude modulations that an estim device interprets as stimulation instructions. The left and right audio channels typically correspond to two independent stimulation channels on the power box, allowing for separate or overlapping sensations across different electrode placements.