Dead Beat:

Crosstalk and noise are caused by EMF, or Electro-Magnetic Fields. In a circuit, rapidly changing currents in wires cause these fields. The strength of these fields are proportional to the flux, or rate of change, of the current in a wire. Because the Drone Lab uses square wave tone generators, every time the square wave changes phase (twice every cycle or 880 times a second for a middle "A" pitch), there is a corresponding quickly changing magnetic field created around the wire. This changing magnetic field induces a changing current in nearby wires, which causes signal crosstalk and noise generation. This phenomenon  has not proved to be particularly problematic with this design, but introducing lots of unshielded flying wires to off board components runs the risk of creating more of this noise.