Splitting Scarlett Solo Inputs

On Ubuntu 24.04 (and other systems using PipeWire, I imagine), two-input devices have their inputs mixed together into a single stereo input. This is problematic if you want to use one input in one program without that program hearing the other input.

In my case this was so I could use a microphone in Discord and a radio transceiver audio output for dsd-fme without sending one to the other. In your PipeWire config directory of choice, e.g. ~/.config/pipewire/pipewire.conf.d/, create a file called my-loopback-2.conf (the name isn't important). Inside this file place the following:

context.modules = [
{   name = libpipewire-module-loopback
    args = {
        node.description = "Scarlett Focusrite Line LEFT"
        capture.props = {
            audio.position = [ FL ]
            stream.dont-remix = true
            node.target = "your_device_name"
            node.passive = true                                       
        }
        playback.props = {
            node.name = "SF_mono_in_1"
            media.class = "Audio/Source"
            audio.position = [ MONO ]
        }
    }
}

{   name = libpipewire-module-loopback
    args = {
        node.description = "Scarlett Focusrite Line RIGHT"
        capture.props = {
            audio.position = [ FR ]
            stream.dont-remix = true
            node.target = "your_device_name"
            node.passive = true
        }
        playback.props = {
            node.name = "SF_mono_in_2"
            media.class = "Audio/Source"
            audio.position = [ MONO ]
        }
    }
}
]