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Volume Swells
Auto Swell (EMM Nov 81)
This Week's Preset: Mobius - Fast Volume Swells - Strymon
Guitar Pedal X - GPX Blog - Pigtronix's 80's-inspired Star Eater Fuzz and Gloamer Volume Swell make for a Striking Pair
TC Electronic CRESCENDO AUTO SWELL Responsive Crescendo Pedal with 2-Knob Interface for Haunting Guitar Line Manipulation : Amazon.co.uk: Musical Instruments & DJ