The way I see it, it's similar to SCV-radio system that came out first
on, I think Corvette convertibles.  This system is a "speed compensated
volume" control--the faster you drive, the louder the radio plays to
compensate for increased extraneous noise from increased speed.  I see a
similarity to the torque signals--when it malforms, you can surely feel it
when, say rounding a curve--a deep-seated feeling in the tummy of loss of
control.  HTH, s