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Well... there is quite a bunch of "serious audio" software available for IRIX.

Yeah, if I had to guess, I'd bet on IRIX too. But it seems that IRIX uses [AL (Audio Library)](https://nixdoc.net/man-pages/IRIX/man3d/alIntro.3d.html), not OSS.

Irix "uses?"

I'm sure there are one or two SGI boxes still ticking out there, but I haven't booted mine in months.