The Gravitas is capable of many classic tremolo sounds, from simple volume modulation to brownface-style harmonic trem. It can even do both...at the same time. It's a truly inspiring box that will serve you well forever.
The Fuzzulator utilizes a circuit within a circuit, which Demeter calls the Tone Pre-Emphasis circuit, which emphasizes certain frequencies to help the fuzz cut like a knife. This pedal, like the OverDrivulator, is equipped with a Tight-Loose switch that changes the clipping stack.