Sub N Up Pedal A electric guitar pickup is basically much like a powerful microphone coil. For many years, vibrant microphones have now been wired with the style coil mounted on the primary of the microphone's transformer, and not referenced to ground (‘floating'). The microphone's event is typically attached to the cable shield, that will be connected to the microphone amplifier's ground (see Rane's site for more discussion).
By and big, dynamic microphones are extremely calm units as a result of the mix of transformer isolation and balanced, floating indication lines during, in addition to shielded, humbucking coils.
Therefore why not guitars? Guitars are notoriously overwhelmed by noise. Humbucking pickups are only a partial (though important!) solution. The most obvious solution is to float your guitar collection to a balanced output, as being a microphone. The same thought was printed this 2001 patent software such as Sub N Up Pedal?