Ключевые слова: adjust, amplifier, audio, background, button, center, circle, concept, control, design, electrical, electronic, entertainment, equipment, finger, hand, holding, ideas, indoors, knob, level, loud, loudness, loudspeaker, man, modern, music, musical, new, panel, power, push, radio, round, settings, shiny, silver, sound, speaker, stereo, studio, switch, symbol, system, technology, touch, tuner, turn, volume, white,