If you are looking to get a good octavix/Octavia type effect in this pedal, you may want to reconsider(MHO)...

Very cool, subtle effect

Like not a real effect

For the price, this guy puts out a pretty good range of fuzz, and the octave up effect is decent for high and high-mid ranges

The octave effect is strong if used properly; I am setting (Fuzz) it at 8 o'clock, using the neck pickup, and accepting the fact that any of these only have a strong effect on certain parts of the neck (around the 10th to 15th fret, listen to Blue on Black; he's playing it there).

Also, these have two capacitors on the PCB which were soldered backwards (their polarities are reversed) and if you take the time to switch them around you'll get a much better effect

I certainly expected a little better effects but maybe I expected too much

The JF-12 fulfilled the purpose with relatively clean boost, decent overdrive, great fuzz, and a reasonable octave generator effect

it's a good, affordable effect