Boss Fz 5 A guitar pickup is essentially just like a powerful microphone coil. For many years, active microphones have already been sent with the voice coil mounted on the principal of the microphone's transformer, and maybe not called to ground (‘floating'). The microphone's event is typically linked to the cable shield, which is connected to the mike amplifier's soil (see Rane's web site for more discussion).
By and big, active microphones are very calm units consequently of the combination of transformer isolation and healthy, floating indication lines throughout, in addition to guarded, humbucking coils.
Therefore why not instruments? Instruments are notoriously overwhelmed by noise. Humbucking pickups are merely a partial (though crucial!) solution. The most obvious answer would be to float practicing the guitar pickup to a healthy output, being a microphone. A similar idea was printed that 2001 patent request like this Boss Fz 5?