...I shouldn't dwell on this... but what's the red rocker switch, labelled VFD, do?, it's shown off, but the VFD is powered - so it's not a VFD power switch (unless it's borked). That's not been slaved to the VFD "Forward" signal has it?, So if you press the rocker on (1) what does the rotary knob do?

And really stupid question - you got no instructions with this?