use a passive DI and add a 10 K-ohm resistor in series with the signal connection inside a 1/4" plug. Terminology While "reverse DI" re-recording techniques have been used for decades, the process was popularized in part by the introduction of the Reamp device in 1993. The registered trademark "Reamp" describes a patented invention () filed in 1994 by audio engineer John Cuniberti, perhaps best known for his lifelong engineering work with guitarist Joe Satriani. The Reamp inductively couples balanced line-level sources into unbalanced guitar-level destinations (e.g., DAW output to guitar amp input) and includes a potentiometer which alters both signal level and source impedance. Derivations of the Reamp trademark, such as "reamping" and "re-amplification," have become common terminology in professional audio to describe the process of amplified re-recording – much like the word "Band-aid" is often used to describe adhesive bandages (see Genericized trademark). History The process of re-recording has been used throughout the history of recording studios. Pierre Schaeffer in the 1930s and 1940s used recorded sounds, such as trains, and played them back with ambient alteration, re-recording the net result. Karlheinz Stockhausen and Edgard Varèse later used similar techniques. Les Paul and Mary Ford recorded layered vocal harmonies and guitar parts, modifying prior tracks with effects such as ambient reverb while recording the net result together on a new track. Les Paul placed a loudspeaker at one end of a tunnel and a microphone at the other end. The loudspeaker played back previously recorded material - the microphone recorded the resulting altered sound. Roger Nichols claims to have used a guitar re-recording process (not reverse DI) in 1968, partly to spread the stress on cranked tube amps across multiple amps, one at a time. A sound would be dialed-in for several hours on one cranked guitar amplifier, and if this stress audibly wore down the amplifier components, another amplifier would be used to record the remaining work. It has been noted that Phil Spector, re-mixing the original Beatles’ Let It Be master tapes in 1970, may have re-recorded dry electric guitar program through a guitar amplifier. Film sound re-recording is a time-honored practice. Sound designer Walter Murch is known for a technique called "worldizing" in which "real world" ambiance is added, via re-recording, to dry recorded program. Sound designer Nick Peck describes the worldizing process: "Place a speaker in a room or location with the desired aural