Electric apparatus for commutation, namely, electric circuits and electric transformers; Scientific, photographic, cinematographic, measuring, signaling apparatus and instruments, electronic monitors and monitor modules for monitoring electric current and electrical signals; Apparatus and instruments for conducting, switching, transforming, accumulating, regulating or controlling electricity; Apparatus for recording, transmission and reproduction of sound, images, and data; Apparatus for storing and organizing sound, images, videos and data, namely, blank tapes memory devices, and storage media for storage of computer data; Apparatus for recording transmission and reproduction of videos, namely, digital video recorders and personal video playback apparatuses; Blank magnetic data carriers, blank recording discs; Pre-recorded magnetic data carriers and recording discs featuring music rhythms, pulses, sounds, or electrical signal characteristics; Automatic, data processing equipment and computers; Apparatus for connecting a plurality of headphones to audio reproduction apparatus, namely connection cables and connection bus apparatuses; Computer hardware and computer software programs for the integration of text, audio, graphics, still images and moving pictures into an interactive delivery for multimedia applications; Computer hardware for upload, storage, retrieval, download, transmission and delivery of digital content; Computer programs for editing images, sound and video; Computer software for interpretation of neuro and brain scans provided by diagnostic imaging equipment; Downloadable scientific and medical data via the internet; Electronic products for the generation, measurement, and analysis of audio signals, namely, audio analyzers; Electronic products for the manipulation of the frequency, time, and amplitude characteristics of audio signals, namely, audio processors; Integrated circuits and integrated circuit cores for use in wireless communications and wireless communication equipment and apparatus and digital signal processors (DSP); Personal headphones for sound transmitting apparatuses; Personal headphones for use with sound transmitting systems; Portable and handheld digital electronic devices for recording, organizing, transmitting, manipulating, and reviewing text, data, image, and audio files; Transmitters and receivers for audio and video signals for transmission over twisted pair cables; Transmitters of electronic signals; Acoustic coupling apparatus for use with the ear, namely, headsets, headphones, and earphones