I just bought a Bachmann Spectrum 2-10-2 with DCC. I want to add sound and according to Bachmann I should get the TSU 1000 or TSU 750 and a speaker for sound. According to the instructions I should unplug the 8 pin plug from the socket and plug in the new 8 pin plug wired with all the color coded wires in a certain sequence. But; my 8 pin plug has wires coming off of it going to a plastic peace with Bachmann's name on it. Do I still unplug the 8 pin plug and add the new one color coded with the speaker or what? Thanks for your help Roy "the new guy". All of this electronic stuff is new to me.