Apparently when you’re using OpenAL.

There is a multichannel test binary that you can run. (C:\Program Files (x86)\OpenAL 1.1 SDK\samples\bin\win64\PlayMultiChannelWin64.exe). It should run

front left, center, front right, rear right, rear left, and subwoofer.

Instead, it’s running

front left, front right, and center.

I’ve verified that all eight speakers are working in the test app that comes with the drivers. I’ve also verified that the sound is correctly sent using the Control Panel Sound->configure tool. So I’m not sure if it’s OpenAl or something else. Ah well. That’s for tomorrow.