Roland Multitrack Recorder A electric guitar pickup is basically much like an energetic mike coil. For decades, energetic microphones have been wired with the voice coil attached to the principal of the microphone's transformer, and perhaps not recommended to soil (‘floating'). The microphone's situation is normally attached to the cable shield, which will be attached to the mike amplifier's floor (see Rane's web site for more discussion).
By and big, active microphones are very quiet devices consequently of the mix of transformer solitude and healthy, flying sign lines throughout, along with shielded, humbucking coils.
Therefore why don't you instruments? Guitars are notoriously affected by noise. Humbucking pickups are only an incomplete (though important!) solution. Well-known alternative would be to float the guitar collection to a balanced productivity, as being a microphone. An identical thought was printed this 2001 patent software like this Roland Multitrack Recorder?