The system was controlled by Meyer Sound Galileo . The side-hang featured 10 MICA boxes per side , with four UPJs for front-fills . Ron Hurd , the tour 's monitor engineer , mixed the show using a Yamaha PM5D console . Hurd said , " I 'm not using any plug-ins or rack gear except for an Apogee Big Ben word clock . Six of the nine guys are on ears : Ultimate Ears with Sennheiser G2s . " Slipknot began touring at the first ever Mayhem Festival , a music festival founded by Kevin Lyman and John Reese . During the opening date of the Mayhem Festival 2008 on July 9 at Auburn , Washington , turntablist Sid Wilson broke both of his heels after jumping from an elevated area of the stage and landing incorrectly . Despite the injury , he promised to perform on all dates of the tour in a wheelchair . Wilson returned to the band , in a wheelchair and with both his legs in casts , on the second date of the festival at Mountain View , California ; he did , however , perform without the wheelchair at times
Mayhem Festival 2008
Mayhem Festival 2008
All Hope Is Gone World Tour