Inc/Dec value of max object in javascript?

This one might be a little advanced...it is getting more and more rare these days when I find something that trips me up.

I have this nifty little "MIDI Learn" tool that allows you to click on UI elements in your Max patch and assign MIDI controllers to these objects dynamically.

Here is a link to the midilearn Tool - with access to the source code:

https://cycling74.com/tools/midi-learn-for-max/#.VycuGmMyMpc

The problem I am currently trying to solve is that one of my controllers has a knob - which you can turn - however, it doesn't send MIDI CC values as you would expect - it sends a value of 127 for every click of turning clockwise, and value of 0 for every click of turning counterclockwise.

So what I need to do is whenever one of these types of MIDI controls is assigned to a UI element, I need to increment/decrement the current value based on a MIDI CC value of 127/0. This should be easy...

Here is the problem. I don't know how to query the current value of an object from javascript.

So lets say I have already acquired a javascript reference to my UI object and assigned it to a var : obj. I can do things like:

var obj = this.patcher.getnamed(nameofobj);
var thisPatcher = obj.patcher; // this works just fine
if (obj.understands("rawfloat")) {
  obj.message("rawfloat", newval / 127.0);  // this works just fine
}

What I want to do is something like:

if (control == incdecTypeControl)
{
 if (ctlValue == 0) {
     obj.value -= 1;    // or whatever value I have determined is the incremental value
    // you can't do this because there is no "value" parameter for a max object - which is kinda absurd
}
else if (ctlValue == 127)  {
    obj.value += 1;  // there is no obj.value - so how do I increment the value?
}
}