IIRC the (default: constant Q) GEQ is 1/3 octave per band. The PEQ can do 1/9th of an octave, which might be better for notching feedback. There are multiple types of GEQ selectable though, including the “Proportional Q,” which narrows the Q (beyond 1/3 octave) the more severe the boost/cut. Both PEQ and GEQ can operate on the same bus simultaneously. Select a bus, go into the processing screen and the GEQ tab, and press the “?” on the touch screen to read about the different types of GEQ. This also works in Editor if your not in front of the GLD ATM.