Related Clues:

• It pumps up the volume, for short
• Rocker's gizmo
• Band piece
• Part of a sound system
• Rock-band gear
• Radio signal booster
• Fender product
• Bassist's need
• Increase the intensity, with 'up'
• Guitarist's accessory, for short
• Load for a roadie
• Electric guitar need
• Rock band's need, for short
• Booster on stage
• Rock concert fixture