“May be very rare? The O-Ring is an octave/fuzz/ring mod combination with controls for Low and High. It’s known for being quite a mystery box … extremely noisy and strange, sounding like an angry beehive. It’s been compared to an MXR Blue Box with a little something extra — I’d say that’s accurate. To make it really rip, put an overdrive next to it and you’ll flip for how it sounds.”
A review can be found here.