Moog's MF Trem is no simple tremolo pedal. While most tremolos will let you dial in the effect you want with speed and depth knobs, those knobs are not so straightforward here - there's a lot of interaction between them and the other two knobs.
"This pedal is capable of many more sounds than a standard tremolo pedal, or an amp's built-in trem"
The depth knob, for example, increases depth for most of its travel, but doubles the trem speed when at its max position. A shape knob alters the waveform for a more lopsided throb, while the tone knob rolls back the treble content.
The overall effect is that this pedal is capable of many more sounds than a standard tremolo pedal, or an amp's built-in trem.
You can get those classic optical tremolo sounds, but also harder 'gated' on/off percussive trem. The expression pedal is assigned to speed, so you can get rotary speaker-like ramps and, with the speed knob set to full, even ring mod-style effects.
A versatile tremolo for all seasons.