Apparatus and instruments for processing sound, namely electronic sound processing apparatus; audio mixers; professional sound mixing consoles; sound mixing apparatus for recording, broadcasting and the sound reinforcement of theatre and auditorium sound and for use in video and film dubbing; electronic apparatus for processing multiple audio input signals into a reduced number of output signals, namely digital signal processors and limiters and compressors; audio amplifiers and equalisers; assignable dynamics processors, namely integrated circuit signal dynamics processors, and audio dynamics processors; microprocessors, processor units, key pads, key boards and visual display units in the nature of flat panel display screens, all for use in relation to the processing of audio signals; fader and mute automation systems comprised of fader regulators, boosters and equalizers; electric power supply units and transformers, all for audio apparatus; stands and dust covers specially adapted for the aforesaid goods; integrated circuit modules for use in the aforesaid goods; structural parts and fittings for the aforesaid goods; sound cards; software and computer programs, all relating to audio for use in mixing and regulating sound; software and computer programs for use in the processing, mixing or reproduction of sound