External Valve Plate for Suzuki SUB-30 Harmonica Custom Covers Brownie is also wearing the

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External Valve Plate for Suzuki SUB-30 Harmonica Custom Covers Brownie is also wearing theThe External Valve Plate (EVP) was developed about a year after the BMH 30 comb. Valves enable you to control the air flow to specific reeds. Because the SUB 30 has three reeds in each chamber as compared to two in a standard diatonic harmonica, valves are necessary to prevent specific reeds from playing when you don't want them to. The stock SUB 30 has 10 valves. The Blue Moon EVP enables you to add 10 more valves via a single component. It requires

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