The ‘78 IC Op-Amp Fuzz V5 is the same exact circuitry as the V4. The V5 includes a very handy Tone Bypass switch that helps fatten the EQ, effectively bringing the midrange back into the fuzz tone. The ‘78 V5 is a great option for any player who loves the Op-Amp Muff sound and feel, but also needs to poke through a mix. This pedal shows some play wear and a few scratches on the back of the enclosure, but functionally and sonically, it's in great shape!