 Guitar technicians who work for an acoustic band, such as a folk group or bluegrass ensemble may be responsible for setting up and stringing, and tuning a range of stringed, fretted instruments including acoustic guitars, dobros, and mandolins.A guitar tech for a heavy metal band, on the other hand, may focus mainly on electric guitars, guitar amplifiers, and effects pedals.A guitar tech may change the sequence of effects pedals or alter the settings on effects pedals during the show, to assist the guitarist in creating different tone colours or sounds.