APPARATUS AND INSTRUMENTS FOR PROCESSING, REPRODUCING TRANSMITTING AND RECORDING SOUND AND IMAGES, NAMELY, ELECTRONIC UNITS USED TO EFFECT THE SOUND OF MUSICAL INSTRUMENTS, ELECTRONIC TONE GENERATORS, ELECTRONIC CIRCUITS FOR TONE GENERATORS, RECORDERS AND PLAYERS OF MIDI DATA, ELECTRONIC MUSIC SEQUENCERS, MIDI INTERFACES, RHYTHM PROGRAMMERS, NAMELY, ELECTRONIC UNITS USED TO GENERATE MUSICAL RHYTHMS AND BACKGROUNDS IN A VARIETY OF STYLES AND INSTRUMENTAL VOICES, SAMPLING UNITS NAMELY, DIGITAL ...