Apparatus for recording, transmission, and reproduction of sound; apparatus for creating, processing, retrieval and manipulation of sound, namely, audio mixers, feedback suppressors, audio enhancers and exciters; microphones, microphone preamplifiers; direct input boxes for connecting guitars, basses and keyboards (as well as other line-level devices and other sound sources) to audio mixers and recorders; electronic sound mixing consoles, electronic dynamic sound effects processors, sound effects processors and signal processors; sound equalizers and crossovers; audio controllers, namely, software for processing sound; audio interfaces for connecting sound sources, microphones, musical instruments, mixers, directly to the computer or other similar apparatus; signal distribution devices, namely, signal splitters for electronic apparatus, electronic signal switches for audio signals, electronic radio signal amplifiers, transmitters of electronic signals; signal converters, headphone amplifiers, headphones, power amplifiers, loudspeakers; apparatus for controlling lighting, namely, electronic regulating and control devices for the operation of light emitting diodes; computer software for creating, recording, transmission, processing, retrieval, manipulation and reproduction of sound; downloadable product manuals in electronic format all in class 9