Carts ''tuning'' seems to be the prerogative of ''carts masters''.
This imply that those ''masters '' are clairvoyant because they
know how their cart will sound ,say, 100 hour later. The question is
what their tuning means. To my knowledge only Van den Hul is
willing to (re) adjust his carts after 300 hour of use. Why should
he do this? Is he less clairvoyant than his copmetitors? My guess
is that people accomodate to a particular sound and think that
not their hearing but the cart changed. ''Self-deception'' is the
name of this phenomena.