Related Clues:

• Gig equip.
• Guitarist's aid
• Intensify, with up
• A little resistance?
• Intensify, with "up"
• Concert piece?
• Rock band's accessory
• A little resistance
• Crank (up)
• Electrician's word of meditation?
• Rock band booster
• Sound investment for a band
• One for the roadie
• Increase, with "up"
• Unit in a physics textbook