[Bug 299277] Recording monitor broken (monitor as in audio out)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=299277

            Bug ID: 299277
           Summary: Recording monitor broken (monitor as in audio out)
           Product: Base System
           Version: 15.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: dave@daveg.ca

Let's get terms out of the way first.  I'm trying to record what I would
otherwise hear.  This is the monitor audio.

When I try to use the obvious tools, like audacity or sox, it fails.  In an
interesting contrast, OBS works.  It works in it's default configuration and it
works specifying my /dev/dsp1 (which is an output-only optical out).

My setup: FreeBSD-15.1p4, amd64.  64G ram.

[1:98:398]root@hit:~> grep pcm /var/run/dmesg.boot 
pcm0: <Realtek ALC1220 (Analog 5.1+HP/2.0)> at nid 20,22,21,27 and 24,26 on
hdaa0
pcm1: <Realtek ALC1220 (Rear Digital)> at nid 30 on hdaa0
pcm2: <Realtek ALC1220 (Front Analog Mic)> at nid 25 on hdaa0
pcm3: <NVIDIA (0x009a) (HDMI/DP 8ch)> at nid 4 on hdaa1
pcm4: <NVIDIA (0x009a) (HDMI/DP 8ch)> at nid 5 on hdaa1
pcm5: <NVIDIA (0x009a) (HDMI/DP 8ch)> at nid 6 on hdaa1
pcm6: <NVIDIA (0x009a) (HDMI/DP 8ch)> at nid 7 on hdaa1
pcm7 on uaudio0
[1:99:399]root@hit:~> cat /dev/sndstat 
Installed devices:
pcm0: <Realtek ALC1220 (Analog 5.1+HP/2.0)> (play/rec)
pcm1: <Realtek ALC1220 (Rear Digital)> (play) default
pcm2: <Realtek ALC1220 (Front Analog Mic)> (rec)
pcm3: <NVIDIA (0x009a) (HDMI/DP 8ch)> (play)
pcm4: <NVIDIA (0x009a) (HDMI/DP 8ch)> (play)
pcm5: <NVIDIA (0x009a) (HDMI/DP 8ch)> (play)
pcm6: <NVIDIA (0x009a) (HDMI/DP 8ch)> (play)
pcm7: <HP, Inc HyperX Cloud Alpha Wireless> (play/rec)
No devices installed from userspace.
[1:106:406]root@hit:~> mixer -f /dev/mixer1
pcm1:mixer: <Realtek ALC1220 (Rear Digital)> on hdaa0 (play) (default)
    vol       = 0.36:0.36     pbk
    pcm       = 1.00:1.00     pbk
[1:107:407]root@hit:~> 

... so recording from /dev/dsp1 works from OBS, fails from sox and audacity.

[1:14:314]dgilbert@hit:~/aircheck> sox -r 48k -b 16 -v 0.99 -t oss /dev/dsp1 -t
wav out.wav
sox FAIL formats: can't open input  `/dev/dsp1': open failed for device:
/dev/dsp1

I try virtual_oss with the following and I get a file of 0 values.
virtual_oss -Q 0 -C 2 -c 2 -r 48000 -b 16 -s 1024 -P /dev/dsp1 -R /dev/null -w
vdsp.wav -l dsp

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