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Here are the Ambient Sounds currently available on HomePod with iOS 13.2:
White
Stream
Rain
Ocean
Night
Forest
Fireplace
How to use HomePod Ambient Sounds to play white noise, rain, fireplace, more
Make sure your HomePod is updated to iOS 13.2 (temporarily pulled)
Say a command like, “Hey Siri, play white noise,” or,
“Hey Siri, play rain sounds” (for everything but White noise, make sure to include “sounds” in your command with one of the options listed above)
You can also say “Hey Siri, play Ambient Sounds” to get a random pick
https://9to5mac.com/2019/10/29/how-to-use-homepod-ambient-sounds-white-noise-rain-fireplace/