Sound signal reproducing apparatus, namely circuit boards and processors with on-board synthesizers or digital/analogue signal processing chips; dedicated hand held, portable, stand-alone or networked computers containing circuit boards with on-board synthesizers or digital/analogue signal processing chips; loud speakers, stereo receivers and amplifiers; public address systems comprising a microphone, an amplifier, and a speaker; public broadcast systems comprising a microphone, an amplifier, and a transmitter; sound recording apparatus, namely magnetic and optical recorders; video signal reproducing apparatus, namely video disk readers and video-card readers; electronic games, namely, interactive video games of virtual reality comprised of computer hardware and software; computers; environment-responsive electrical apparatus, namely, temperature sensors, sound sensors, humidity sensors, pressure sensors, visible-light sensors, infra-red sensors, pH-value sensors, galvanic skin sensors, brain-wave sensors, proximity sensors, fluid sensors, voltage sensors, current sensors, photoelectric sensors, and electrical apparatus for environment conditioning, namely; pH adjusters, pressure regulators, voltage regulators, current regulators, and photoelectric regulators; parts and fittings for all the aforesaid goods, sold together therewith as a unit; computer software used for creating, modifying, playing and recording sounds, sound effects, music and speech; computer software used for creating, modifying and playing visual effects, computer software used for creating computer games; computer software used for creating virtual reality games; computer software used for creating computer-based learning and training packages; computer software used for creating stress reduction packages; computer software used for augmenting other software packages or authoring tools with sound, music or images; computer software used for creating sound, music or images within an Internet application; computer software used for creating, modifying and controlling environmental moods or ambiences; pre-recorded optical and magnetic data media, namely, compact disk read-only memory, audio compact disks, floppy disks, DAT recording magnetic tape, audio cassette tapes, optical disks, video compact disks, erasable programmable read-only memory, hard disks, PCMCIA (personal computer memory card international association) cards, cartridges, flash cards, random access memory, all containing recordings of music, speech, visual images, synthesized sounds and/or natural sounds