"Background Audio - 04" is an intriguing soundscape that discreetly combines elements of technology and nostalgia. In this composition, one can identify the utilization of Virtual Studio Technology (VST), which is integral in producing and manipulating audio. The audio prominently features 'bleep' sounds, reminiscent of classic arcade games, giving it a playful, retro vibe. These sounds are further enhanced through the 'resampling' technique, which involves digitally altering the audio for a more dynamic and textured effect. The audio also incorporates 'glitch' elements, creating an intentional sense of disruption or error, adding a unique charm to the composition. The influence of the 'Amiga', a prominent personal computer in the 1980s and '90s, is evident in the nostalgic tone of the audio, providing a trip down memory lane for those familiar with the era. The 'PCM' or Pulse Code Modulation technique is used to digitally represent the analog signals, contributing to the clarity a