I received the Teensy 3.2 and audio shield yesterday and ran a few of the hardware test examples as well as the tutorial examples but I had no luck in getting any output on the headphone jack, what am I doing wrong? I watched the video below: https://youtu.be/wqt55OAabVs But I currently have no buttons or pots hooked up to the Teensy, will I not hear anything without the volume pot? If so is there a schematic somewhere for the circuit they're using in that video?