I sent a ticket to uxsoftware to answer this.
While I wait for a response, has anyone else ran into this problem (and possibly found a solution).
With the following RX code
Track last Horizontal Split for 12 spins to Record "PrevSpins" layout
I receive these results for the following winning numbers
Number 1 Split(1-2)
Number 3 Split(2-3)
Number 8 Split(7-8)
Number 10 Split(10-11)
and so on
The results I would like to receive are
Number 1 Split(1-4)
Number 3 Split(3-6)
Number 8 Split(8-11)
Number 10 Split(7-10)
an so on
It seems Vertical Splits are the default, even though I coded for a Horizontal Split.
For anyone who is interested, here is the response I received from uxsoftware
Hello
I reviewed your request and below and you are correct. Horizontal and Vertical are together. Vertical first.
As of this time, there is no command to specify Horizontal vs. Vertical, however, that can be added in third quarter this year.