Null-A two orange squeezers in one box. I saw this on ustomp.com and thought what could go wrong?
This is a Green Ringer with both the filter mod and nulling mod. I found these mods at General Guitar Gadgets.
The filter mod filters the input signal to bring out a stronger octave. The nulling mod helps tune in the octave generated by balancing the signal on each half of the wave form.
The filter mod is switchable. With the switch on the octave is very pronounced. With an almost cartoonish character.