An Alfred workflow (+ CLI tools) to control Rogue Amoeba's Loopback virtual audio devices — because Loopback has no official automation support.

• Toggle devices instantly from Alfred with lb
• Assign hotkeys to toggle specific devices (via Alfred's built-in hotkey triggers)
• Filter by typing — just start typing the device name
• Visual status — see which devices are enabled/disabled at a glance
• CLI tools included for scripting and automation

1. Download Loopback-Control.alfredworkflow
2. Double-click to install
3. Type lb in Alfred

Want to toggle a device with a keyboard shortcut?

1. Open Alfred Preferences → Workflows → Loopback Control
2. Click the + button → Triggers → Hotkey
3. Set your hotkey (e.g., ⌃⌥M)
4. Connect it to the "Run Script" action
5. In the script, put: python3 loopback_toggle.py "Your Device Name"

Now you can toggle any device with a single keystroke.

Type lb in Alfred to see all your Loopback virtual devices:

Two command-line tools are included for scripting:

Instant toggling via macOS accessibility. No restart required.

loopback-ctl list                    # List all devices
loopback-ctl toggle "LB Bose"        # Toggle a device
loopback-ctl enable "LB Bose"        # Enable explicitly
loopback-ctl disable "LB Bose"       # Disable explicitly
loopback-ctl status "LB Bose"        # Check status

Requires: Accessibility permissions for your terminal.

Modifies Loopback's config directly. Works headless, supports batch operations.

loopback-plist list                  # List all devices
loopback-plist toggle "LB Bose"      # Toggle a device
loopback-plist set "A=on" "B=off"    # Batch toggle (single restart)

Note: Restarts Loopback (~0.5s audio interruption).

Loopback stores device configs in ~/Library/Application Support/Loopback/Devices.plist. These tools:

1. Read/modify the enabled flag for each device
2. Restart Loopback to apply changes

The GUI scripting approach (loopback-ctl) clicks the checkbox directly, avoiding the restart.

No devices found?

• Make sure Loopback is running
• Check you have virtual devices configured

loopback-ctl not working?

• Grant Accessibility permissions to your terminal
• Ensure Loopback window exists (not minimized with no window)

Device name not found?

• Names must match exactly — use loopback-ctl list to check

MIT. Not affiliated with Rogue Amoeba.