Script that enabled loopback mode via pulseaudio and disabled it after use. This was used to loop audio from my laptop through my desktop to my monitor

loopback-audio

#!/bin/sh
num=$(pactl load-module module-loopback channels=2)
echo $num
pactl set-source-port alsa_input.pci-0000_00_1e.2.analog-stereo analog-input-linein
pactl set-source-volume alsa_input.pci-0000_00_1e.2.analog-stereo 45%

zenity --info --title="Line In Active" --text="Press ok after Game Session"

pactl set-source-port alsa_input.pci-0000_00_1e.2.analog-stereo analog-input-microphone\;input-microphone-1
pactl set-source-volume alsa_input.pci-0000_00_1e.2.analog-stereo 100%
echo "unloading id: ${num}"
pactl unload-module ${num}