Quick audio interface switch for Mac OS

audiointerfaceswitch.sh

#!/bin/bash
CURRENTINTERFACE=`/usr/local/bin/SwitchAudioSource -c`
EXTERNALINTERFACE="FiiO USB DAC-E10"

if [ "$CURRENTINTERFACE" = "$EXTERNALINTERFACE" ]
then
  /usr/local/bin/SwitchAudioSource -t output -s "Built-in Output"
  /usr/local/bin/SwitchAudioSource -t system -s "Built-in Output"
else
  /usr/local/bin/SwitchAudioSource -t output -s "$EXTERNALINTERFACE"
  /usr/local/bin/SwitchAudioSource -t system -s "$EXTERNALINTERFACE"
fi

/usr/local/bin/notify "`/usr/local/bin/SwitchAudioSource -c`" "Current audio interface"

HOWTO.md

1. Create a /usr/local/bin/audiointerfaceswitch.sh file with the content above. Change "FiiO USB DAC-E10" with the name of your interface. Run /usr/local/bin/SwitchAudioSource -a to get a list of the available interfaces on your system.
2. With Automator.app, create an app
3. Run the app to switch interfaces. Use a launcher or BetterTouchTool or a similar tool to map the app to a keyboard shortcut.

Switch_audio_interface_app.jpg