More recently, he has produced successful American metal band Avenged Sevenfold's albums Waking the Fallen and City of Evil, as well as albums for Slunt, The Riverboat Gamblers, Powerman 5000, Eighteen Visions, Unloco, Dave Reffett, Alice Cooper, and 50 Foot Wave's EP, Power and Light.
Produced by metal-veteran, Andrew Murdock, the band's sound took an unexpected, somber turn toward a more melodic, metal-acoustic style.
As Cryogenic and Mudrock, who were working together, had both lost their vocalists, Henno contacted Santos and asked him to join the band, to which Santos accepted.
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