This plugin modulates the pitch of its input signal with a low-frequency sinusoidal signal. It is useful for guitar and synth tracks, and it can also come handy if a strange effect is needed.

source: http://tap-plugins.sourceforge.net/ladspa/vibrato.html

Credit: Tom Szilagyi