Apparatus for recording, transmission or reproduction of sound or images; apparatus for the digital and analogue mixing, forwarding, processing and storage of sound and/or image signals for use on radio and television, and for live performances and shows, in particular mixing desks, namely, sound mixers, audio mixers, computer hardware for the upload, storage, retrieval, download, transmission and delivery of sound and/or image signals; electrical connecting parts, namely, electrical and electronic connectors, electrical cables for use in connections; electric cables; wires, namely, electric and electrical wires, magnetic wires, power wires; conductors, namely, electric conductors; electric display apparatus, namely, electronic display interfaces, liquid crystal displays, flat panel display screens; computer software for manipulating digital or analogue sound data for regulating, sound quality improvement and/or compression purposes, computer software for controlling and regulating sound engineering installations; electronic display boards; sound receiving apparatus, namely, audio receivers, stereo receives, radio receivers, microphone receivers; remote-control apparatus, namely, remote controls for radios, televisions, mixing desks; interfaces, namely, interfaces for computers, electronic display interfaces, sound devices; electric regulating apparatus, namely, voltage regulators for electric power, voltage and/or current regulators for lighting systems, apparatus for regulating or controlling electric current; plugboards, namely, audio signal patch panels, electric control panels, lighting control panels; switching equipment, namely, automatic switchboards, electric switches; electricity distribution consoles; switches, namely, power switches, light switches; sound recording apparatus; sound locating instruments, namely, sound level meters; sound direction determination devices, sound transmitting apparatus; sound amplifiers; sound reproducing apparatus; electronic memory card readers and writers; apparatus for inscribing and/or reading optical and/or magnetic data carriers, namely, CD-ROM writers, optical readers, laser writers, and optical and magneto-optical disc players and recorders; modules, namely, printed circuit boards; and checking apparatus for the aforesaid goods, namely, electronic testing equipment in the nature of sound level meters, electrical apparatus for testing the state of mixing desks