9 Downloadable software and firmware for encoding, decoding, and processing audio data; downloadable software and firmware for encoding audio data; downloadable software and firmware for decoding audio data; recorded software and firmware for encoding, decoding, and processing audio data; recorded software and firmware for encoding audio data; recorded software and firmware for decoding audio data; apparatus for encoding and decoding audio data; apparatus for encoding audio data; apparatus for decoding audio data; headphones; earphones; earbuds; microphones; audio speakers; audio receivers; audio amplifiers; audio equalizers; audio mixers; audio transmitter units; sound recording apparatus; apparatus for recording, transmission, and reproduction of sound.