ModVibe is a delay vibrato with a couple of features to mix things up. There are two delay units - the first is a forward delay and the second is a feedback delay. In between these two is a modulation unit to scramble, shake, sift and swirl the contents. The vibrato oscillators are independently set and can be shaped using frequency modulation.
The vibrato units are fairly straightforward, except that the delay can range from a few milliseconds to 4500.0 ms. Between the two, that's a bit of delay. In addition, the vibrato can be up to 500.0 ms in depth. These two combined provide effects ranging from phaser/flanger and chorus to wild, extreme doppler shifts. The sweeps can be tailored to a high degree giving a lot of flexibility.