DCC Equipped 4-8-4

[3dmike]

I recently bought the Cavailer set with a DCC equipped Class J 4-8-4.  I would like to add sound.  After looking at the drawing for the DCC equipped and the DCC Sound, the only difference I see is a speaker added to the DCC Sound.

Both the PCB and the decoder are the same.

What do I need to do to add sound?

New to DCC...

[SteamGene]

You need a sound decoder and a speaker(s).  You probably also will need to cut the capacitors.
Merry Ninth Day of Christmas.
Gene

[3dmike]

So the decoder in the unit will not work if I just add a speaker.

Will I have to remove the old decoder and install a new one? 

Can I buy an OEM sound decoder?

[SteamGene]

You will need a sound decoder.  You will also need a speaker if the decoder comes without a speaker. 
Merry Eleventh Day of Christmas.
Gene

[3dmike]

Any suggestion on choice of sound decoders?

[ta152h0]

I have seen no answer yet on this forum the methodology to adding sound to a decoder already installed in the machine. I personally just bought decoders with sound ( speaker attached ) and replaced the factory electronics in my 4-8-4. I am guessing the sound software is not burn't into the factory boards that come with factory DCC Equipped locomotives. I have a 2-10-0 decapod with a LENS decoder and the manual states you have to add a S.U.S.I. sound card to add a speaker resulting in having to solder four wires to described pads on the decoder. So my Decapod sounds so electric.

[3dmike]

So back to my orginal thinking remove the OEM decoder and purchase a new one with sound.

Does Bachmann sell the same decoder they use in sound equipped modeles?

Thanks

[SteamGene]

They do not yet.
Have a great Twelveth Night.
Gene