Keyboard shortcut to mute/unmute default microphone (or other default audio source)

microphone-toggle

#!/bin/sh

notify-send \
    --expire-time=700 \
    "$(pacmd list-sources | awk 'BEGIN { FPAT = "[^ \t]+|\"[^\"]+\"" } $1 == "*" { find=1 } $1 == "device.description" { if (find) { print substr($NF,2,length($NF)-2); exit; } }')" \
    "→ $(amixer set Capture toggle | grep -oP '(?<=\[)o[nf]+(?=\])' | sort -u)"

xbindkeysrc

"microphone-toggle"
shift + XF86AudioMute

"microphone-toggle"
XF86AudioMicMute