NoasArk_PTBS-1_Mod Programmable Switching System Noah's Ark PTBS-1 Modification. Adding MIDI Out JJ1LFO's Blog Modifying the Noah's Ark PTBS-1 Programmable Switcher to Add MIDI Output schematic/ Modified KiCAD Original JJ1LFO's Blog Draw a circuit diagram for the programmable switcher Noah's Ark PTBS-1 src/ MPLAB X IDE project Add MIDI Program change Output