Full Version: How the PlayStation boot-up sound works
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Some few interesting bits about the PlayStation boot-up sound.
It is actually a composition of 3 different sounds stored in the console's hard drive, as seen here: a bell chime, a reversed clip of glass breaking, and a synth sound.

These clips are sped up and slowed down to produce the boot-up sound, and they also serve to check if the system is running correctly. Some of the PlayStation error screens end up distorting the clips - the most notable two are "Personified Fear" (which cuts the bootup off at the 'whoosh' sound) and "Fearful Harmony" (where the bell chimes are repeated).
Some explanations can be seen here: