I have a Spectrum 4-6-2 steam locomotive with DCC on board.  I am adding sound and have purchased the correct decoder and speaker.  When I opened the tender I found a circuit board with a 8 pin plug and what I assume is the DCC decoder.  I think, according to what I've read, is a 8 pin plug on the DCC/Sound decoder I'm installing.  The circuit board threw me a curve.  This is my first sound installation and I'm a little confused.