Fixing Audio Channel Down-Mixing in VoodooHDA (Tahoe)

Restoring Stereo Output on MSI Z490 Tomahawk

If VoodooHDA is treating your stereo speakers as a 5.1 system on macOS Tahoe, you need to modify the Info.plist inside the kext.

The Fix:

  1. VoodooHDA Settings: Right-click VoodooHDA.kext > Show Package Contents > Contents > Info.plist.
  2. NodesToPatch: Find the NodesToPatch section. You need to 'untask' the Orange and Black jacks by setting their ConfigDefault to 0x40f000f0 (Disabled).
  3. Vectorize: Set Vectorize to True to improve audio processing efficiency on your i9-10850k.
  4. Rebuild Cache: Run sudo kextcache -i / and reboot.

Original Question: "Tahoe with VoodooHDA channel down mixing"

Tahoe with VoodooHDA channel down mixing

Hi all,

I just upgraded from Sequoia 15.7.7 to Tahoe 26.5.1 over the weekend. One of the issues I ran into was the fact that AppleALC doesn't work in Tahoe any more, so I had to migrate to VoodooHDA. That's functioning, but I'm having a problem with audio channels, I think.

In the previous setup, the AppleALC system knew that I had only a pair of speakers, so multi-channel audio (5.1, etc) were downmixed to stereo.

With VoodooHDA, I don't seem to have the right set of choices for audio outputs. I'm given the following: * 5.1CH (Green+Orange+Black Rear) * Headphones (Green Front) * SPDIF-out (Black Rear)

My speakers are only plugged into the green audio jack on the back, so I'm only getting L+R through that.

This is my hardware:

Hardware Details
Processor i9-10850k
Motherboard MSI MAG z490 Tomahawk
GPU ASUS Radeon RX 6600 XT 8GB
OpenCore 1.0.7
VoodooHDA 312
macOS 26.5.1

For the VoodooHDA install, I installed it in /Library/Extensions per the instructions, but I've not done any other configuration. I suspect that I need to specify a layout or something like that somewhere.

Does anyone have any hints on what my configuration might be missing to allow me to use only the rear Green jack?

Thanks!

submitted by /u/HookersWithBlow
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