https://m.youtube.com/watch?v=S1GvxldhZDQ
At about 5 or 6 minutes in he talks about a trick he uses during refining to tonematch his old recorded guitar tracks.
Not sure if I missed any steps but:
I tested this by creating a profile, then during refining I sent a recorded track to my return and a DI to the input. It actually came out very close to the recorded track's overall sound, even though when I started it wasn't even in the ballpark.