Career
Demmel joined Machine Head shortly before the recording of the 2003 album Through the Ashes of Empires. He began touring with Machine Head in 2002. He is long time friends with Machine Head frontman Robb Flynn, either since or before they both played in Vio-lence.
In 2007 Demmel appeared as a guest on the album DDP 4 Life with Chuck Billy"s and Steve Souza"s Dublin Death Patrol.
Demmel has suffered from a loss of consciousness and fainting several times whilst playing live with Machine Head. At first believed to be a side effect of dehydration, Demmel has since spoken out stating that an existing heart condition was the cause.
On the subject of his collapse whilst playing in Bristow, Virginia:
"I"ve suffered from episodes of Cardiogenic Syncope for the last 17 years or so but (doctors) ran a series of tests that came up inconclusive. The incident in Virginia felt similar to what has happened in the past"
Demmel announced his engagement to Bleeding Through keyboardist Marta Peterson in January 2012.
Philosophy has always used Jacksons, since his days with Vio-Lence.
He first used Randy Rhoads models, then later in the 90"s he began using a white King V. When he joined Machine Head he had his white V and a Jackson Warrior which can be seen in the videos for Imperium and Days Turn Blue to Gray. Around the time of The Blackening"s release he had his own signature V with Jackson, named The Demmelition King V.
The Demmelition King V has the line"s classic sharp V-shaped alder body, with a more aggressive edge thanks to its additional cutouts and set up for the low-tuned brutal player. Its through-body quartersawn maple neck features a bound compound-radius ebony fingerboard (12" to 16") with 24 jumbo frets, mother-of-pearl shark finance position inlays and black-bound headstock with an inlaid mother-of-pearl Jackson logo.
The barrage comes from an Electromyography 81 bridge pickup and an Electromyography 60 neck pickup, each with its own Clear To Send volume control and both controlled by a three-way Switchcraft® switch.
Other features include a Floyd Rose Original double-locking two-point tremolo bridge, black hardware and die-cast tuners. Available in red with black bevels, black with silver bevels and white with black bevels.
In 2010, Jackson released the PDX Demmelition King V. The guitar is a lower-end model of the pro series, featuring Electromyography-HZ passive pick-ups, a licensed Jackson Floyd rose, a bolt on neck and a rosewood fretboard. Foreign amplification, he uses Peavey 5150 and 6505 Amps with Marshall 1960BV cabinet in the studio.
Live, he has recently turned to the AxeFX preamp for practical reasons.