Virtual sinks are not working

[sfjuocekr]

When using a virtual sink, pipewire.conf.d/virtualsink.conf:

context.modules = [
   { name = libpipewire-module-loopback
     args = {
        node.description = "MicSolo"
        capture.props = {
           node.name = "MicSolo_capture"
           media.class = "Audio/Sink"
           audio.position = [ MONO ]
        }
        playback.props = {
           node.name = "MicSolo_playback"
           media.class = "Audio/Source"
           audio.position = [ MONO ]
        }
     }
   }
]

Virtual sinks are shown, but when I try to select one and press the OK button it reverts back to the "Default".

[dimtpap]

Add audio.channels = 1 in the properties