Sounds in Petscop are used in various ways. It's hard to write a description for this so just go with it, OK?
Played when the closet reopens when the scene resets.
Fanfare when the Needles Piano is picked up, shared with the sound effect when sitting at the desk in Petscop 15.
Background audio consisting of a thud, followed by a constant falling and rising hum, and then a clock ticking with occasional large-clock chimes.
The clock ticks and chimes are, unlike the rest of the noises, played in stereo, with a slight echo.
Sound that plays when the texture editor ("NIFTY menu") is opened or closed.
Phonetic speech system
Each character has a unique sound that plays when finishing a word.
Sound used when the Player speaks.
Sound used when Marvin speaks.
Sound used when Belle/Tiara speaks.