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and audio recording, reproduction and processing apparatus, namely, multi-effects units, digital converters, digital processors, devices producing harmonic distortion, sound mixers, mastering consoles; Audio recording, reproduction and processing equipment, namely, apparatus for sound recording, processing, metering, playback, and playing devices for sound carriers, sound recording and sound processing machines; audio summing mixers; Audio racks, audio rack kits; digital to analog converters; analog to digital converters; audio recording, reproduction and processing apparatus, namely phono preamplifiers, headphone amplifiers, preamplifiers, digital to analog converters, and analog to digital converters; Audio recording, reproduction and processing equipment, namely, microphone preamplifiers, preamplifiers, mixing consoles, equalizers, compressors, limiters, channel strips, frequency filters, signal processors, and multi-effect signal processors; audio mixers; audio signal processing devices; power supplies; direct injection boxes