This pickup offers the ability to blend an internal microphone with an under saddle piezo. For large stages where feedback can be a problem, we recommend setting the “mic blend” knob at 0 (all the way to the left), which turns the mic input down and uses mainly the under saddle piezo. This setting is the least prone to feedback. The mic is to be used as a subtle flavor to add air and ambiance to the sound, and can be rolled on carefully, but using it will add to the possibility of feedback.
Additionally, there is a small trim control (accessible when you open flip open the preamp). This control governs the overall gain of the mic. It’s a good idea to adjust it so that at maximum mic blend it’s slightly softer than the pickup signal.