Once the unit was 'working' again, I confirmed my original statement that this pedal is just a glorified volume control

Because the controls are side-mounted on the 535Q, they me be more vulnerable to damage than the top-mounted controls on the BH-2.Features: Both are very versatile wah pedals

The footswitchable volume boost can be set anywhere between 0-+16dB, and the famous "Q" control allows you to control which frequency range is covered by the sweep of the pedal.