I've been there—tweaking the pedal settings on your Donner module can really bring out the dynamics of a good double bass. I've had success with pedals that offer adjustable tension and sensitivity; some folks swear by models with more programmable options, such as the Roland ones, although a solid, well-reviewed third-party pedal can work just as well if configured properly. Fine-tuning the dead zones and sensitivity in the module to match your playing style makes all the difference.