No Sound Output to One Stereo Pair on Multi-Channel Interface

[extrakredit]

Is there an existing issue for this?

• This is a bug in RetroArch frontend
• I have searched the existing issues

Description

Using USB Audio Interface RME Fireface 802

Issue is the same whether I choose WASAPI or DSound.

11 stereo pairs are listed for selection. Sound outputs to 10 of the 11. The stereo pair ch15/ch16 does not receive sound when selected. All other channels work fine.

The problematic pair works with other Windows applications. The pair is also listed at the bottom of the list on the device selection in RA.

The problem started suddenly and persists across fresh builds.

Expected behavior

Select stereo pair under devices and get sound output from RA

Steps to reproduce the bug

1. Use RME Fireface 802 on Windows 11 64 bit OS
2. Launch Retroarch
3. Select any other pair and monitor sound, select ch15/ch16 and get no sound

Note: this config was working for me for many years, then suddenly stopped working, so might be difficult to reproduce. Also not sure if the fact that the problematic pair shows up at the bottom of the list is related.

Version/Commit

1.22.2

Bisect Results

No response

Present in the nightly version

Yes, this is reproduced in the nightly build

Platform & operating system

Windows 11 Home 25H2

Affected Cores

No response

Environment information

No response

Relevant log output

[Ryunam]

1. Can you try an older build of RetroArch and see if the issue persists or disappears that way?
2. Does the issue happen with the xaudio driver as well?

I'm not aware of any specific audio change being implemented recently, so I suspect it might be something unrelated to RA itself.