How would push pull DC bias sound like on each half track of a magnetic tape?

Would it be more quiet?


For example recording the same audio signal on each track but with reversed DC polarity. Then summing the 2 signals. Would some bias induced tape noise be statistically canceled?


Would this technique help sound on sound? Ie recording many signals on each pass of a tape by disabling the eraser head?


Would reversing the polarity of DC for each overdub even on a single track tape produce batter noise results? Or a larger reversed DC bias as tape is nonlinear.