Geezer Buttler Signature Pedal Of Doom Pedal – Ashdown Engineering
Geezer Butler on Black Sabbath's early days, the making of 13 and which album has the worst bass sound | Guitar World
Geezer Butler's Basses and Gear Explained + Iommi's Exclusive Statement About Mysterious Wah Used on Black Sabbath's Debut | Articles @ Ultimate-Guitar.Com