@@ -91,6 +91,10 @@ var knobsClass = {

                     break;

                 }

             v += d * (contains(object, 'factor') ? object.factor : 1);

+            if (contains(object, 'range'))

+                if ((contains(object.range, 'max') and v > object.range.max)

+                or  (contains(object.range, 'min') and v < object.range.min))

+                    return;

             val = sprintf(object.format, v);

             me.device.windows.window[me.device.windows.selected]

                 .setText(val);