void OnValidate()
 {
     if (inputs == null || inputs.Length == 0)
     {
         inputs    = new KntrlSelector[1];
         inputs[0] = new KntrlSelector();
     }
     for (int i = 0; i < inputs.Length; i++)
     {
         if (inputs[i] == null)
         {
             inputs[i] = new KntrlSelector();
         }
         inputs[i].OnValidate(this);
     }
     selectedInput = _selectedInput;
     HandleVisualizers();
 }