Amp Drive- Because a big part of overall Polivoks character comes from its voltage-controlled amplifier (VCA) section, we've modeled and included it in the Master section. The VCA is essentially "open" all the time, but the Amp Drive knob sets its level of distortion drive.
Volume and LED output meter- Sets Filtomika's overall master output volume. You'll want to keep the signal level in the green, as going into the red can create not-nice digital clipping - the opposite of the desirable raunchy distortion Filtomika excels at.