Digitech Whammy 4 A guitar collection is actually just like a dynamic mike coil. For many years, dynamic microphones have now been sent with the voice coil mounted on the principal of the microphone's transformer, and maybe not recommended to soil (‘floating'). The microphone's case is normally connected to the cable shield, which is connected to the mike amplifier's ground (see Rane's web site for more discussion).
By and large, powerful microphones are very quiet devices as a result of the mix of transformer isolation and healthy, floating sign lines throughout, in addition to shielded, humbucking coils.
Therefore why don't you instruments? Guitars are notoriously plagued by noise. Humbucking pickups are merely an incomplete (though essential!) solution. The most obvious answer is always to move your guitar pickup to a balanced production, as being a microphone. The same thought was printed this 2001 patent application such as Digitech Whammy 4?