It’s a sturdy, useful box in its own right though – with warm vintage tones, devastating fuzz and plenty of EQ shaping. Terence ‘Geezer’ Butler is a perennial hero of bass guitar, inspiring generations of musicians with his distinctive, powerful playing. The names state intent – the amp is called the Head of Doom, and this black box is the Pedal of Doom. Seems a waste perhaps, for a pedal with so much distortion on tap – but those cleaner tones are very characterful and usable, evoking classic tube-driven bass amps. Read more: Ashdown John Myung Double Drive reviewHands-on videosAshdown EngineeringAshdown Geezer Butler Pedal Of Doom Demo - YouTube Watch OnMetalhead Productions