I have a Bachmann GP40 that is DCC ready.  Is there a plug-in DCC and sound all in one board for these?  I assume I would have to add a speaker but was hoping for the DCC and sound in one board so no soldering. 

Thanks

Not that I am aware of but you could check the parts page. The decoder is a PC board that is wired to the pickups and speaker that is in the oil tank. Not a simple plug in.
You could check the Soundtraxx page and see if the have a suggestion. They have a decoder selector for Bachmann locos and speaker
The two suggestions are solder in.
The TCS site is solder in.
I assume yours is an eight pin socket.
Others will suggest.

Rich