The vibrato units are fairly straight forward, 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 phasor/flanger and chorus to wild, extreme doppler shifts. The sweeps can be tailored to a high degree. The result is a range of sounds from subtle to out-there, other-worldly lunacy.