Apparatus and instruments for recording, transmitting, processing, mixing, sending, switching, storing, outputting, playing or reproduction of sound or images, namely, sound and picture recording and reproducing apparatus, electronic sound mixing, processing and synthesizing apparatus, sound projectors and amplifiers, microphones, cameras, and sound, music and video editing appliances in the nature of sound mixers, audio mixing consoles, editing machines for movie films; sound or image processing apparatus and computers; control desks being electronic apparatus for processing sound and video data; mixing desks for processing sound or video being audio mixing consoles and video mixing desks; electronic control panels for processing sound or video; sound, music and video mixing consoles and equipment, namely, audio mixing consoles, sound mixers, video mixing desks; audio and video playback machines; sound equalizers; audio filters, being electronic sound filters; audio and video input, output and monitoring apparatus, namely, sound level meters, digital sound processors; sound level meters; loudspeakers; audio level oscillators; digital reverberators being digital signal processors; audio correlation graduators being digital sound processors; apparatus for digital and analogue signal processing; amplifiers; preamplifiers; microphone preamplifiers; audio-frequency transformers; limiters and compressors for processing sound; computer-aided loop control devices being signal processors for use with all the aforesaid goods; sound and video data carriers being blank optical and magnetic data carriers; downloadable computer programs and downloadable software, all for processing sound and video; recorded computer programs and software all for processing sound and video; downloadable computer software for signal processing; downloadable emulation software for processing audio and video; structural and replacement parts for all the aforesaid goods