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A sheet of Silent Coat applied to the insides of the black hood of the Puristika, a small square covering the indentation for "cup warmer" and the two sides. There is roughly 3dB less noise gained by this, less overtones. The hood is amplifying the pump noise acoustically like say an acoustic guitar's body. I'll keep distance and mic level the same for all videos, but the playback sound level might get normalized.