microphones; loudspeakers; headphones; earphones; audio amplifiers; audio mixers; audio mixing consoles; audio signal processors for microphones, loudspeakers, and amplifiers; equalizers being audio apparatus; electric and electronic effects units for musical instruments; amplifiers for musical instruments; downloadable computer software for generating, reproducing, effecting, and recording sound; downloadable computer software for adjusting sound quality for use with audio mixers; downloadab...