Today, I addedsound boards to my MOPAC GP-7 and my MOPAC BL-2 AA pair.
I have 3 more EMD boards to use, then I'll need to shop for 5 ALCO FA boards.
I really like being able to do this. I have such a fear of electrical and electronics work. I made my way through shop class by doing the blueprint drawings for the guys in class....I couldn't cut straight to save my life.
I did end up making baffles for the speakers from paper towel rolls. Works pretty good!