Best Loop Pedal For Guitar A guitar pickup is actually similar to a vibrant mike coil. For decades, active microphones have been wired with the voice coil attached with the principal of the microphone's transformer, and maybe not referenced to soil (‘floating'). The microphone's event is usually linked to the wire shield, that is linked to the microphone amplifier's surface (see Rane's website for more discussion).
By and large, powerful microphones are extremely quiet devices consequently of the combination of transformer isolation and healthy, suspended indication lines through the duration of, as well as protected, humbucking coils.
Therefore why don't you instruments? Instruments are notoriously overwhelmed by noise. Humbucking pickups are merely a partial (though important!) solution. The most obvious answer is always to move practicing the guitar pickup to a healthy output, as being a microphone. A similar idea was printed this 2001 patent application like this Best Loop Pedal For Guitar?