Korg Microkey 25 A electric guitar pickup is basically just like an energetic mike coil. For many years, powerful microphones have now 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 case is usually linked to the cable guard, which is connected to the mike amplifier's surface (see Rane's site for more discussion).
By and big, powerful microphones are extremely quiet units consequently of the mixture of transformer isolation and healthy, suspended sign lines during, as well as shielded, humbucking coils.
Therefore why don't you instruments? Guitars are notoriously plagued by noise. Humbucking pickups are just an incomplete (though important!) solution. The most obvious solution is to float practicing the guitar pickup to a balanced output, just like a microphone. An identical strategy was printed this 2001 patent software such as Korg Microkey 25?