 On May 12 , 2006 , Martin Lopez announced that he had officially parted ways with Opeth due to health problems , and was replaced by Martin Axenrot . Opeth toured on the main stage of Gigantour in 2006 , alongside Megadeth . Ghost Reveries was re @-@ released on October 31 , 2006 , with a bonus cover song ( Deep Purple 's " Soldier of Fortune " ) , a DVD featuring a 5 @.@ 1 surround sound mix of the album and a documentary on the making of the record . A recording of Opeth 's live performance at the Camden Roundhouse , in London , on November 9 , 2006 , was released as the double live album The Roundhouse Tapes , which topped the Finnish DVD chart . 
