The Mooer Soul Shiver is a modulation pedal that gives you 3 classic 60s psychedelic sounds in an easy to use compact package. You got the classic watery Chorus sound to fatten up your sound. There is also a Vibrato mode which changes the pitch of your notes just as if you were adding vibrato with your fingers. Used tastefully this is an awesome effect, to bring out a little sway in your chords or lead lines. Lastly there is a Rotary, like a Leslie Speaker Cabinet effect where the sound is rotated giving a swirling choppy sound. This effect isn't just for keyboard players.