I just noticed an internal switch, here what I found after a bit of research. Even more options, nice!
"EQ in/out switch: In the factory/default position, the pedal’s tilt-EQ circuit is active and controlled by the external EQ knob. Switching it out bypasses the tilt-EQ section, giving the pedal a flatter frequency response; the EQ knob then has no effect."
This pedal has the usual marks from general use, there is a scuff next to the tilt-EQ knob.
Please use photos as part of the description.
See my other guitar / studio related equipment.