Controlling iZotope RX sliders with MIDI faders and knobs

Great progress!

Is it possible to modify a logical part of the script to make SF record each time the current velocity value

Yes we could do this. Right now it looks like you're using an absolute MIDI knob and then your script is only reacting once you hit the boundaries (minimum and maximum value, respectively).
Don't you have the possibility of using relative MIDI knobs - or is this not supported on your MIDI device? They would give you the best experience.

If you need to work with absolute knobs, and then compute the relative change yourself, you could save the last value of m2 in a global state variable, and then react accordingly:

var m = event.trigger.midiBytes;
var m0 = m[0], m1 = m[1], m2 = m[2];

if (m0 == 176 && m1 == 16) {
    //Get the last recorded slider value
    var lastValue = globalState.lastSliderValue;

    if (m2 > lastValue) {
        //The new value is larger than the last value, ie. positive delta

        //Fader up
        setSliderValueDelta(1, -0.2);
    } else if (m2 < lastValue) {
        //The new value is smaller than the last value, ie. negative delta

        //Fader down
        setSliderValueDelta(1, 0.2);
    }

    //Now store the current value as the last recorded slider value
    globalState.lastSliderValue = m2;
}

Hi Dustin,

I think something like this should get you working:

/* CONFIG HERE */

const sliders = {
    14: () => sf.ui.izotope.windows.whoseTitle.is('Spectral Repair').first.groups.whoseDescription.is('EffectPanel Spectral Repair').first.sliders.whoseDescription.is('Surrounding region length [%]').first,
    15: () => sf.ui.izotope.windows.whoseTitle.is('Spectral Repair').first.groups.whoseDescription.is('EffectPanel Spectral Repair').first.sliders.whoseDescription.is('Before/after weighting').first,
};

/* SCRIPT, DON'T TOUCH */

function setSliderValueDelta(slider, deltaValue) {

    if (!slider || !slider.exists) throw 'Could not find slider';

    var intDelta = Math.floor(deltaValue * 10);
    var absDelta = Math.abs(intDelta);

    if (intDelta > 0) {
        for (var i = 0; i < absDelta; i++)
            slider.elementClick({ actionName: 'AXIncrement' });
    } else if (intDelta < 0) {
        for (var i = 0; i < absDelta; i++)
            slider.elementClick({ actionName: 'AXDecrement' });
    }
}

function main() {

    var m = event.trigger.midiBytes;
    var m0 = m[0], m1 = m[1], m2 = m[2];

    var sliderFunc = sliders[m1];

    if (m0 == 176 && sliderFunc) {
        //Get the UI item
        var slider = sliderFunc();

        //Get the last recorded slider value
        var lastValue = globalState['lastSliderValue_' + m1];

        if (m2 > lastValue) {
            //The new value is larger than the last value, ie. positive delta

            //Fader up
            setSliderValueDelta(slider, 0.2);
        } else if (m2 < lastValue) {
            //The new value is smaller than the last value, ie. negative delta

            //Fader down
            setSliderValueDelta(slider, -0.2);
        }

        //Now store the current value as the last recorded slider value
        globalState['lastSliderValue_' + m1] = m2;
    }

}

main();

You set up the relationship between CC values and the sliders in the CONFIG HERE section.

Try changing this:

if (m2 > lastValue) {
            //The new value is larger than the last value, ie. positive delta

            //Fader up
            sliderDeltaFunc(1);
        } else if (m2 < lastValue) {
            //The new value is smaller than the last value, ie. negative delta

            //Fader down
            sliderDeltaFunc(-1);
        }

to:

if (m2 > 64) {
            //The new value is an increment value

            //Fader up
            sliderDeltaFunc(1);
        } else if (m2 < 64) {
            //The new value is a decrement value

            //Fader down
            sliderDeltaFunc(-1);
        }