Original: Chris Fehn ( # 3 ) Active : 1998 -- present Instruments : custom percussion , backing vocals Release contributions : all Slipknot releases from Slipknot ( 1999 ) to present Following the departure of Greg Welts , Chris Fehn was brought in to fill the position left on percussion and backing vocals .
Simplified: Chris Fehn ( # 3 ) Active : 1998 -- present Instruments : custom percussion , backing vocals Performed in : all Slipknot releases from Slipknot ( 1999 ) to present After Greg Welts left the band , Chris Fehn joined Slipknot as the new percussionist and backing vocalist .