Amplifiers; Digital to analogue converters; Analogue to digital converters; Analogue to digital audio converters; Amplifiers being audio apparatus; Apparatus for broadcasting audio signals; Audio amplifiers; Apparatus for processing audio signals; Apparatus for recording audio signals; Audio and video receivers; Audio apparatus; Audio apparatus for vehicles; Audio digitisers; Audio dubbing apparatus; Audio electrical apparatus for in-car entertainment; Audio electronic apparatus; Audio electronic instruments; Audio equipment; Audio frequency apparatus; Audio instruments; Audio interfaces; Audio mixers; Audio mixing apparatus; Audio mixing console apparatus; Audio mixing desks; Audio mixing machines; Audio players; Audio processing apparatus; Audio processing apparatus for use with video apparatus; Audio conference apparatus; Audio conference instruments; Apparatus for use in audio-visual communication; Apparatus for transmitting audio signals; Alignment equipment for electronic audio apparatus; Audio products for use in vehicles; Audio racks adapted for use with audio equipment; Audio recording apparatus; Audio recording instruments; Audio recording of intra-uterine sounds; Audio recordings; Audio signal level controlling apparatus; Audio signal processing apparatus; Audio speakers; Audio speakers for automobiles; Audio speakers for home; Audio switching apparatus; Audio test instruments; Audio testing apparatus; Background audio broadcasting apparatus; Audio transmitter units; Car audio apparatus; Car audio instruments; Compact disc audio reproducers; Compact discs (audio-video); Control apparatus for audio signals; Crossover networks for audio apparatus; Digital audio cassette tapes; Digital audio disc players; Digital audio players; Digital audio signal processors; Digital audio tape players; Digital audio tape recorders; Digital audio tapes; Downloadable audio files authenticated by non-fungible tokens [NFTs]; Door entry apparatus utilising audio apparatus; Downloadable audio recordings authenticated by non-fungible tokens [NFTs]; Downloadable multimedia files containing audio authenticated by non-fungible tokens [NFTs]; Electrical apparatus for the transmission of audio signals; Electronic audio apparatus; Electronic audio effects apparatus; Electronic audio signal processors for compensating sound distortion; Electronic mixers for mixing signals in the production of audio recordings; Electronic units for transmitting audio signals; Equalisers (audio apparatus); Equalizers (audio apparatus); Graphic decoders for use with audio karaoke systems; Headphones for audio apparatus; High fidelity audio apparatus; Integrated audio amplifiers; Signal processors for audio speakers; Speakers (audio equipment)