Several years ago I wondered whether this obscure format could be played back using a free audio decoder (I downloaded such a file that according to its metadata was encoded in 2000):

I was pleasantly surprised yesterday to find out that the file I downloaded played back perfectly on Hyperbola GNU/Linux using MPlayer and mpv without using non-free binary codecs.

Apparently, FFmpeg developed an encoder for this format in version 2.2 (which was released in 2014), probably 10+ years after this format was commonly used for distributing online audio, and both MPlayer and mpv apparently use FFmpeg's decoder to playback the audio.

You can find a few samples in this format here to see if your video player supports it:

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