High-end, active, magnetic soundhole pickup with internal microphone and on-board buffering and blending.Professional-level hum canceling Stack® pickup mated with an on-board omni-directional electret condenser microphone. The entire tonal spectrum of the acoustic guitar is accurately amplified. Includes master volume control and mic blend control. The magnetic pickup is always on. Blending in the mic adds sparkle and detail to the overall tone. Blending out the mic makes the pickup more feedback resistant. Twelve adjustable pole pieces allow for the best possible string balance regardless of neck radius