This code is provided as is and it allows an arduino mega to be used as a tascam DB25 pinout tester. It has attached an 16x2 LCD a switch and a few connectors (DB25F, XLRM, XLRF and a pin test point). The pins used can be obtained from the code.
You can see it in action on youtube: https://youtu.be/kJNsBL_HVWQ