How to reproduce:
1. Use and configure an audio device that supports output to 4 channels
2. Use software that allows to monitor audio output to all of the 4 channels
3. Open the attached "QuadAudioIssue.zip" project
4. Make sure that "Default Speaker Mode" is set to "Quad" (Edit -> Project Settings -> Audio)
5. Open the "TestScene"
6. Enter Play mode
7. Observe the outputs to each channel in your audio monitoring software
Actual result: The audio outputs to only 2 channels
Expected result: The audio outputs to all 4 channels
Reproducible with: 6000.0.0f1, 6000.0.79f1, 6000.3.20f1, 6000.5.4f1, 6000.6.0b4, 6000.7.0a2
Reproducible on: Windows 11, macOS 26.5
Not reproducible on: No other environments tested
Notes:
- If the “test_4channel” audio file preview is played in the Inspector, the audio output is as expected
- If OnAudioFilterRead is used in a script to write directly to all 4 channels, the audio output is as expected