ProRMP

From Radial Engineering:

For years, Reamping has been the ‘secret weapon’ for countless recordings by the biggest names in the business! Few realize that recording engineers not only Reamp® guitars, but often Reamp® bass, keyboards, drums and even voice as a means to bring creative new tones and sonic signatures to their music.

The Radial ProRMP is a 100% passive Reamper. This means it does not require any external powering. The magic behind the ProRMP's great tone is a custom wound transformer that at once converts the balanced line level source to a hi-z output for your amp while also acting as an electrical isolator to eliminate troublesome ground loops that can often cause buzz and hum in the sound. Plug and play easy to use, the ProRMP connects from the recorder to your amp and effects units and does all the impedance matching for you. Just adjust the level to suit!

Record the guitar track using a Radial direct box like the Pro48. This splits the signal so that the guitar player can hear his amp while you capture the clean (dry) performance.