The "StudioLive™ 16.0.2 USB Owner's Manual" says:
4.3.6 Dig Out: Recording EQ and Dynamics
The Fat Channel gives you the option of sending just the unprocessed audio to your computer or including the Fat Channel settings in the recorded signal. When the Dig Out button is enabled, it will illuminate, indicating that the signal being sent to the USB bus is post-EQ and post-dynamics processing. When the button is disabled, the signal being sent to the USB bus is pre-Fat Channel.The Dig Out button is only available when one of the channel inputs is selected. The Main bus automatically sends its signal post-Fat Channel dynamics and EQ.
Note: All USB sends are pre-fader except for the Main outputs. For more information on using your StudioLive as an audio interface, please consult the StudioLive 16.0.2 USB Software Library Reference Manual.