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[quote user="alloboard"]and you installed a DCC decoder how do you wire a sound decoder into the locomotive. [/quote]Hmm. Not clear from your post.  Do you mean you already put in a two function DCC decoder for motor and lights and you want to add a purely sound decoder to this setup?  Or are you thinking of removing your DCC decoder and installing a typical (3 function) sound decoder (i.e. motor, light, sound)?In any case, adding any decoder where there is no circuit board is called hardwiring, and there is nothing particularly hard about it, other than that you have to know what wire connects to which decoder lead and you will have to use some shrink tubing etc.  Depending on the loco, you may have to isolate the motor and add some leads to the truck pickups from the tracks, and perhaps some wires to the motor contacts.  There are plenty of examples already posted of this proceedure, but ask again if you are stuck.Your desire to add a circuit board and then a decoder to it is a waste of time.
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