virtualDeviceName="VirtualMic" # choose what you like
realMic="alsa_input.pci-0000_24_00.0.analog-stereo.remapped" # choose your current microphone

pacmd load-module module-null-sink "sink_name=${virtualDeviceName}"
pacmd update-sink-proplist "${virtualDeviceName}" "device.description=${virtualDeviceName}"
pacmd load-module module-virtual-source "source_name=${virtualDeviceName}-Source" "master=${virtualDeviceName}.monitor"
pacmd load-module module-loopback "sink=${virtualDeviceName}" "source=${realMic}" "latency_msec=1"

# set new sink as default (optional)
pacmd set-default-source "${virtualDeviceName}-Source"