Updated 06202023-075811
https://soundcloud.com/softwarehistory/apollohttps://apps.apple.com/us/app/apollo-for-reddit/id979274575In case you're entirely oblivious to the recent quarrel between the Read It website (which I've been warning you about since the traumatic moment I first set eyes upon it,) its users, and the makers of its users' only truly elegant means of interacting with its services, any amount of The Vergecast's recent interview with Christian Selig should prove far more educational than I could ever muster.
His iOS/iPadOS-based Reddit client, Apollo, though, was/is literally the singular reason I've ever used Reddit for a variety of reasons, but its custom notification sounds are a particular favorite.
Unfortunately, it appears the sound submenu within the app which allows one to hear (or record) them played back, there, appears to have been blocked off for the app's upcoming premature, doleful demise. This sampler was captured from within that menu quite a while ago, but I was elated to rediscover it today.
Let me know if you'd like just a single one of these and I can chop it up for you.