          action: { type: "xInput", button: "b" },
         },
      ],
   }
</pre>
<p>
   The opposite case is to make a button that operates <b>only when the GPIO 7 is NOT pressed</b>.
   This is almost the same, but we change the shiftBits to zero to say that the button
   only operates when the GPIO 7 shift bits aren't present.
</p>
<pre>
   {
      buttons: [
         // ...earlier button entries go here...
         {
            shiftMask: 0x0001,   // make it sensitive to bit 0x0001
            shift