[Bug 287687] Audio is broken in 14.3

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=287687

            Bug ID: 287687
           Summary: Audio is broken in 14.3
           Product: Base System
           Version: 14.3-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: shamaz.mazum@gmail.com

Hello! Sound is broken after I have updated to 14.3-RELEASE. 

I try to play a file

> Wardruna - Birna.flac: FLAC audio bitstream data, 16 bit, stereo, 44.1 kHz, 176179500 samples

and have very distorted sound which only remotely resembles the original. I
bisected the issue to

> commit 960ee8094913f1f96c6a432d84ae1f153b1a562c
> Author: Christos Margiolis <christos@FreeBSD.org>
> Date:   Tue Feb 25 13:43:39 2025 +0200
> 
>    sound: Allocate vchans on-demand

Setting sysctl dev.pcm.X.play.vchans=0 is a workaround for the problem.

My audio driver is emu10kx

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