You made the right decision. A lot of the problem you experience is related to impedance mismatch. The Yamaha passive pickups require a high impedance input. Acoustic amps are designed with a high impedance input. Some mixers also have that function. But, you chose a very smart and useful product that is purpose designed to solve the exact problem you were experiencing.
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"Lift your head and smile at trouble. You'll find happiness someday."
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