We may understand quantum probability if we assume or accept a variable internal time rate. A cloud of probability of position of a particle is the best example.
The probability of finding a particle in a certain position is ontologically proportional to the average and relative time actually spent by this particle in that position with respect to any other positions it is free to occupy, the total being equal to unity; it is somewhere in there.
A particle spending 80% of its time in C and 20% of its time in D, assuming we use a same external time rate in C and D, can be said to have an existence that is 80% in C and 20% in D. (the % difference in transit time). So, the existence of a particle is spread around within its range of freedom.
Its existence in one place depends on the time spent on average in this place. But why does it spend more time on average in this place?
Physics symmetry is never as beautiful as when one glances into its mirror for a corollary. The particle spends 80% of its existence in C and 20% of its existence in D because the time runs 80% relatively slower in C with respect to D. This variable internal time rate is what determines (causality) where the particle will slow down and stay longer. To the relative internal time rate distribution corresponds the distribution of the relative existence of the particle within its range of freedom.
The observer uses the same clock to observe the particle in C and D. But the time rate is different in C and D. In quantum mechanics, we traded the unobservable internal variable time rate (a.k.a. the hidden variable) for the observable probability of finding the particle, its ontological equivalent.
The Wave Function is just that; a description of the distribution of highs and lows in the internal time rate that determine the highs and lows in the distributed existence of a particle.
By understanding the presence and role of the variable internal time rate we gain causality and unity. It is so simple and certainly crazy enough.
Marcel,