It seems that the “REF” parameter in the schmitt trigger does not work. As seen below, the Ref value is set to 0.5 but the output changes only when the input crosses 0.
“REF” is the logic reference. For the Schmitt there’s one digital input: enable.
The Schmitt trigger output is true when V(IN+,IN+) > VT + VH. The output is false when V(IN+,IN+) < VT - VH.
I’ve added this to the help pages, don’t know how that device got dropped from the documentation.