"It's a fairly noticeable thick Vibrato that he uses, like on 'Suck My Kiss,' he'll bring that on. So it is a really distorted tone but he's got quite a heavy vibrato on it as well. That can get quite psychadelic at once," says Josh Klinghoffer's guitar tech about the Boss VB-2 Vibrato Guitar Effect Pedal.more
This picture (from this page https://www.facebook.com/photo.php?fbid=597200247026394 where it says it is her pedalboard) shows that she uses a Boss VB-2 Vibrato Guitar Effect Pedal which is also mentioned in this interview http://www.hookandlinemag.com/2010/09/interview-with-emily-kokal-of-warpaint.htmlmore
This image comes from [this article from *Pro Guitar Shop*](http://proguitarshop.com/andyscorner/prince-the-unsung-guitar-hero) where they write "Along with his love of Boss effects, Prince is a regular user of the [Digitech Whammy](http://equipboard.com/items/digitech-whammy-pitch-shifting-guitar-effects-pedal), [Dunlop Crybaby Wah](http://equipboard.com/items/dunlop-gcb95-cry-baby-wah-wah) (though he has been known to use a Colorsound Wah as well), and [Line 6 MM4](http://equipboard.com/items/line-6-mm4-modulation-guitar-effects-pedal) modulation modeler."more
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