Hi folks,
today I came upon a system, that had a lot of different HMC-planets (and the first earth-like I found in the perseus-arm). I decided to do some recordings to be able to further distinguish the sounds. I was able to distinguish 4 different HMC sound-compositions, that may be related to the type of atmosphere.
Here are the examples:
High-metal-content-planet with no atmosphere.
This one emits screeching sounds, but very low-pitched
https://youtu.be/qjcV2_uxRdc
High-metal-content-planet with ammonia-atmosphere.
This one emits the screeching-sounds, but very high-pitched. There are other HMC with
ammonia-rich-atmosphere which seem to mute background music leaving just sweeping winds and faint screeching-sounds, but system map reveals that their atmosphere is only "ammonia-rich", while other gases like nitrogen being the larger part.
https://youtu.be/Gt0Ih-ap-8Y
High-metal-content planet with sulphur-dioxide-atmosphere / nitrogen atmosphere / Helium atmosphere /water-atmosphere
This one emits a sweeping music with barely audible background winds. This may be the most common sound of HMC. Moste bluish/cloudy HMC emit this and if there is NO bubbling, then you have a false friend.
https://youtu.be/KVuxG2V2Ej0
High-metal-content planet with carbon-dioxide-atmosphere (terraformable) and methane-nitrogene atmosphere
This one mutes the music quite a bit and has much more wind-sounds, also I hear short screeching sounds. I've found the same sound to be emitted by a non-terraformable planet with methane-nitrogene atmosphere, too. The Video shows the difference between the sulphur-dioxide-atmosphere and the carbon-dioxide-atmosphere
https://youtu.be/IUqnqghg8kY
High-metal-content planet with carbon-dioxide-nitrogen-atmosphere (non-terraformable)
This one sounds quite similar to the sulphur-dioxide-ones. The video shows the difference between the terraformable HMC (carbon-dioxide) and the non-terraformable HMC (carbon-dioxide)
https://youtu.be/a23mHlW6iUc
High-metal-content planet with silicate-atmosphere
This one mutes music nearly completely, but gives a quite windy sound. Not to be confused with ammonia-worlds!
https://youtu.be/2Id7gUk338Y
The last video shows a compilation of the different sounds of HMC-Planets.
https://youtu.be/9Kjf7hABYBg
Hope that helps!