Split-flap display boards rig with expressions and teaching

It sounds like you're wanting to use an expression to control the animation based on when you change the text, rather than keyframe it.  Dan Ebberts who posts here quite a bit is a true master of expressions.  His website is motionscript.com where you'll find lots of useful tutorials.

What you're asking is out of my comfort zone, but I will share this expression (which Dan made for me) which drives the opacity of an effect when the effect's centre property has a keyframe:

fadetime = 0.5;
dur = 1.5;
p = effect("Circle 2")("Center");
val = 0;
if(p.numKeys > 0){
    n = p.nearestKey(time).index;
    if(p.key(n).time > time) {
	    n--;
    }
    if(n > 0){
        t = p.key(n).time;
        if(time < t+dur){
            val = linear(time, t, t+fadetime, 0, 100);
        } else {
	val = linear(time, t+dur, t+dur+fadetime, 100, 0);
        } 
    } 
}

val

So suppose you create a precomp with the spinning and use Essential Graphics to set the display values.  I think it would then be possible to use an expression similar to the above to drive the Time Remapping property.

A binary compare with a triple-loaded operator makes zero sense when you're dealing with numbers. Your code has several issues. That aside your whole setup seems unnecessarily complicated. Unless there is a need to actually see all cards (which most people don't want), you can easily zap through all numbers you need on three boards with repeating animation and e.g. using a simple Math.floor(whateverSliderValue). The setups available on AEScripts.com also seem to simply use time-remapping with expressions on pre-comps, which would make them much more reusable, so perhaps give that a whirl.

Mylenium

Honestly, and no offence, that's like describing an alien's flatulence on Orion Prime. Show us what you have and then we can advise. A simple screenshot of your setup with the expressions and slider rigging exposed could tell us a lot.

Mylenium