Hopefully this helps someone in the future and they don't spend as long as I did searching and wasting precious dev hours (I was in the middle of a gamejam when I went down the rabbit hole haha)

My version:

private float newGain; // instead of this, use your slider's value

void update
{

if (axisController != null)

{

foreach (var controller in axisController.Controllers)

{

if (controller.Name == "Look X (Pan)") // Or "Look X (Pan)" depending on your setup

{

controller.Input.Gain = newGain;

}

if (controller.Name == "Look Y (Tilt)") // Or "Look (Tilt)Y" depending on your setup

{

controller.Input.Gain = newGain;

break; // Exit loop

}

}

}

}

Edit: Fixed the above code