Anyone know how to setup pipewire loopback to route/duplicate audio to the loopback interface? I run: pw-loopback -m-capture-props='media.class=Audio/Sink' -C 0

cat /proc/asound/cards
 0 [Loopback ]: Loopback - Loopback
     Loopback 1
 1 [PCH ]: HDA-Intel - HDA Intel PCH
     HDA Intel PCH at 0x92f40000 irq 86
 2 [HDMI ]: HDA-Intel - HDA ATI HDMI
     HDA ATI HDMI at 0xd8d20000 irq 88
 3 [C170 ]: USB-Audio - Webcam C170
     Webcam C170 at usb-0000:00:14.0-3, high speed

-----pipewire.conf----------
{ factory = adapter
        args = {
            factory.name           = api.alsa.pcm.source
            node.name              = "alsa-source"
            node.description       = "PCM Source"
            media.class            = "Audio/Source"
            api.alsa.path          = "hw:PCH,0"
            api.alsa.period-size   = 1024
            api.alsa.headroom      = 0
            api.alsa.disable-mmap  = false
            api.alsa.disable-batch = false
            audio.format           = "S16LE"
            audio.rate             = 48000
            audio.channels         = 2
            audio.position         = "FL,FR"
        }
    }
 	# Okay, now we add our dmix PCMs
    { factory = adapter
        args = {
            factory.name     = api.alsa.pcm.sink
            node.name        = "alsa-dmix-internal" 
            node.description = "PCM Internal" 
            media.class      = "Audio/Sink" 
            api.alsa.path    = "dmix:PCH,0"
        }
    }
    { factory = adapter
        args = {
            factory.name     = api.alsa.pcm.sink
            node.name        = "alsa-dmix-hdmi" 
            node.description = "PCM HDMI"
            media.class      = "Audio/Sink"
            api.alsa.path    = "dmix:Loopback,0"
        }
    }
------------

and then check: pw-link -Il
  63 alsa_output.pci-0000_00_1f.3.analog-stereo:playback_FL
  81   |<-   92 output.pw-loopback-8699:output_FL
  91   |<-   82 alsa_playback.vlc:output_FL
  65 alsa_output.pci-0000_00_1f.3.analog-stereo:playback_FR
  98   |<-   95 output.pw-loopback-8699:output_FR
  84   |<-   83 alsa_playback.vlc:output_FR
  77 alsa_input.platform-snd_aloop.0.analog-stereo:capture_FL
  89   |->   88 input.pw-loopback-8699:input_FL
  78 alsa_input.platform-snd_aloop.0.analog-stereo:capture_FR
  94   |->   85 input.pw-loopback-8699:input_FR
  92 output.pw-loopback-8699:output_FL
  81   |->   63 alsa_output.pci-0000_00_1f.3.analog-stereo:playback_FL
  95 output.pw-loopback-8699:output_FR
  98   |->   65 alsa_output.pci-0000_00_1f.3.analog-stereo:playback_FR
  88 input.pw-loopback-8699:input_FL
  89   |<-   77 alsa_input.platform-snd_aloop.0.analog-stereo:capture_FL
  85 input.pw-loopback-8699:input_FR
  94   |<-   78 alsa_input.platform-snd_aloop.0.analog-stereo:capture_FR
  82 alsa_playback.vlc:output_FL
  91   |->   63 alsa_output.pci-0000_00_1f.3.analog-stereo:playback_FL
  83 alsa_playback.vlc:output_FR
  84   |->   65 alsa_output.pci-0000_00_1f.3.analog-stereo:playback_FR

als check: wpctl status
PipeWire 'pipewire-0' [1.0.3, g@h]
 └─ Clients:
        35. pipewire                            [1.0.3, g@h, pid:29095]
        36. WirePlumber                         [1.0.3, g@h, pid:29088]
        37. WirePlumber [export]                [1.0.3, g@h, pid:29088]
        79. PipeWire ALSA [vlc]                 [1.0.3, g@h, pid:29111]
        86. wpctl                               [1.0.3, g@h, pid:8848]
        96. pw-loopback                         [1.0.3, h@h, pid:8699]

Audio
 ├─ Devices:
 │      42. Webcam C170                         [alsa]
 │      43. Built-in Audio                      [alsa]
 │      44. Navi 21/23 HDMI/DP Audio Controller [alsa]
 │      45. Loopback                            [alsa]
 │  
 ├─ Sinks:
 │      32. PCM Internal                        [vol: 1.00]
 │      33. PCM HDMI                            [vol: 1.00]
 │  *   57. Built-in Audio Analog Stereo        [vol: 0.48]
 │      59. Navi 21/23 HDMI/DP Audio Controller Digital Stereo (HDMI 3) [vol: 0.40]
 │      60. Loopback Analog Stereo              [vol: 0.40]
 │  
 ├─ Sink endpoints:
 │  
 ├─ Sources:
 │      31. PCM Source                          [vol: 1.00]
 │      56. Webcam C170 Mono                    [vol: 1.00]
 │      58. Built-in Audio Analog Stereo        [vol: 1.00]
 │  *   61. Loopback Analog Stereo              [vol: 1.00]
 │  
 ├─ Source endpoints:
 │  
 └─ Streams:
        80. PipeWire ALSA [vlc]                                         
             82. output_FL       > ALC1220 Analog:playback_FL	[active]
             83. output_FR       > ALC1220 Analog:playback_FR	[active]
        90. output.pw-loopback-8699                                     
             92. output_FL       > ALC1220 Analog:playback_FL	[active]
             95. output_FR       > ALC1220 Analog:playback_FR	[active]
        97. input.pw-loopback-8699                                      
             85. input_FR        < Loopback PCM:capture_FR	[active]
             87. monitor_FL     
             88. input_FL        < Loopback PCM:capture_FL	[active]
             93. monitor_FR     

it looks like the audio is going through a circular loop, but when I run ffmpeg to record output it is just blank(no audio)?