The first two knobs, which set the filter sweep range and resonance peak, or “q,” control the sound of both the initial filter and trailing oscillator. My favorite setting had range at noon and “q” around 2 o’clock, but even the lowest range setting had abundant bass fundamental. Blend mixes the filter and oscillator; when blend is fully to the left, the oscillator is off and decay controls the filter length. With blend in the middle, decay controls how quickly the oscillator’s wahwahwah follows the filter’s bwap. The Bass Auto Q’s sounds aren’t the wildest, but with plenty of bottom always present, they might be the most consistently useful.