REW integrating with the Model 976 means once you connect the Model 976 and measure the speaker's response in the listening environment via REW, you will be able to click on REW's EQ tab - then under "Filter Tasks", you would be able to click "Match response to target" and REW will tell you how to set the filters in the Model 976; you won't even have to analyze or interpret what you see. Under EQ Filters, all your EQ settings would be pre-filled for you and you would manually copy these settings into the EQ on the Model 976 (Don't forget for this to work correctly, you need to tell REW that you are using the Model 976 and tell it if you are correcting the response of a full range speaker, a subwoofer, or a bass limited speaker).

This should really help make the process easier.