Renderer that played synth sound, know its name?

[copse]

To quote someone's blog:

There was some renderer on the Amiga. I forget what it was; maybe one of the landscape fractal thingies? Or the procedural texture synth?
Anyway. It had this weird option. You told it to render a frame, and this being the Dark Age of computer speed, it would go away and think about it for like five years. (actually 10 hours or so).

When it was working, you could click this button to "listen to the render".

It took some kind of internal progress and fed that into a synth, and that played sounds. So you got all these funny blurps and glorps and rumbling.

It was awesome.

Anyone know what it was?