"My Quad Cortex powers on, and everything works fine via the touchscreen and PC connection. However, the physical hardware switches and the master volume wheel are completely unresponsive.
Is anyone else experiencing this same issue?"
Hmmm, that’s an odd one. Doing a backup and a global reset might fix it. I recommend contacting NDSP support first.
Do the LEDs above the foot switches illuminate? I wonder if the ribbon cable that runs between the foot switch board and the main board might not be making a good connection. The volume control plugs into the footswitch board so a ribbon cable issue could affect both.
If it’s still under warranty, contacting NDSP or your dealer would be your first step.
Please keep us posted.