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# Temporarily enables pulse audio's loopback device (so you can
# hear what's plugged into you sound card's input).
# Press any key to stop it and unload the module.
pactl load-module module-loopback latency_msec=1
echo "Now monitoring sound card input."
read -rsp $'Press any key to stop...\n' -n1 key
pactl unload-module module-loopback