Thank you for the information. I was hoping to use the MC-II since I have one lying around (I'm sure I can find something to use it for) I have included a photo of the boards so you can see the small interface boards I was speaking about in the bottom right corner. The smoke unit does "puff" in sync with the sound when the engine is moving. I was just curious as to why the chuff signal went to the motor control board first, then to the sound card. Since the sound board does have some "crew talk" I was hoping it would work with TMCC, but from what Pete says it probably will not.
Again, Thank you for your help.
John