Go to Setup > I/O . On the Input , Output , and Bus tabs, select all paths, click Delete , and then click Default to see your new combined inputs and outputs. Modern Alternatives for Windows
Choose ASIO4ALL v2 as your Playback Engine.
The most common and reliable method for aggregating audio devices on Windows is using ASIO4ALL . This free, hardware-independent driver wraps your WDM (Windows) audio devices into a single ASIO-compatible unit that Pro Tools can recognize. How to Set Up an "Aggregate" Device with ASIO4ALL pro tools aggregate i/o windows download
To achieve the same results on a PC, you must use third-party drivers or software to "bridge" your hardware together. The Best Alternative: ASIO4ALL
Get the latest version from the official ASIO4ALL website. Go to Setup > I/O
In the world of Windows-based audio production, you might find yourself searching for a way to combine multiple audio interfaces or use your computer's built-in headphone jack alongside your USB interface. On macOS, this is easily handled by the "Pro Tools Aggregate I/O" feature in Audio MIDI Setup. However, , as Windows lacks a native system-level utility to aggregate audio devices.
Go to Setup > Hardware and click Launch Setup App . Aggregate Your Devices: Click the wrench icon to enter Advanced mode. The most common and reliable method for aggregating
Hold the 'N' key while Pro Tools is opening to force the Playback Engine dialog to appear.
If ASIO4ALL doesn't meet your needs, newer virtual routing software provides more stability and complex routing options: Making an Aggregate Audio Device in Windows!