Available add-ons Linear audio input add-on plug-in board Digital microphone ICS-43434 add-on plug-in board Digital input/output screw terminal add-on plug-in board [1]Linear audio input add-on plug-in board Order PCB Schematic Parts All credits and references for circuits. Thanks to atuline and his team for the Sound reactive fork [2]Digital microphone ICS-43434 add-on plug-in board Schematic [3] Digital input/output screw terminal add-on plug-in board Order PCB Schematic Parts