How did you do that to the chip?
A new board will cost $45, that will include the sound chips. That one looks like the Northern sound set.
I don't have the Digital Dynamics AC/DC board to compare, but the one you have looks like an ERR board. I looked at the instructions for the two boards, and it appears that it is indeed the DD board.
I looked at the DD and ERR instructions, the two boards are about the same, even the RS connector is in the same place. However, I'm thinking since you do have the DD RailSounds package, you probably have the DD TMCC package as well.
Here's the two outline drawings.
And here's the ERR AC Commander outline. If you flip it around in your mind, you'll see it's a pretty close clone. However, the two white connectors for couplers are absent from yours, so I guess it's the DD board.