script to enable/disable pulseaudio loopback module in order to get eg. mic feedback

mic-loopback.sh

#!/bin/bash
#
# Loads / unloads pulseaudio loopback module in order to eg. be redirect
#  mic input to headphones.
#
# Usage: mic-loopback [on|off]
#

if [ $# -ne 1 ]; then
    echo "Usage: $0 [on|off]" 
    exit 1
fi

if [[ $1 == "on"  ]]; then
    pactl load-module module-loopback latency_msec=1
    echo "pulseaudio loopback module loaded"
elif [[ $1 == "off" ]]; then
    pactl unload-module module-loopback
    echo "pulseaudio loopback module unloaded"
else
    echo "Usage: $0 [on|off]" 
fi