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KNA UK-2 Portable Piezo Pickup w/ Volume Control for Ukulele at No Limit Guitar Co
The Guitar Wiring Blog - diagrams and tips: Acoustic Guitar Volume Control
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KNA SG-2 DETACHABLE BRIDGE PIEZO PICKUP WITH VOLUME CONTROL FOR ACOUSTIC GUITAR | Penny Lane Emporium
K&K Pure Mini Pickup + Volume Control - Acoustic Guitar Pickup System – Strings & Things Music LLC
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