Setting up Pro Tools Aggregate Devices
Pro Tools is very protective of the hardware interface. Usually this means that when ProTools is running it will not share the hardware with another application. There is however an easy workaround by using Pro Tools Aggregate Devices.
1. Pro Tools > Setup > Hardware Setup
Use Launch Setup App to configure based on your hardware.
2. AudioFinder > Options > Audio Output Device > Pro Tools Aggregate I/O
The result should be AudioFinder and Pro Tools both using the same hardware.