Bachmann DCC Sound

[keystone]

Mr Bachmann
Have recently purchased 2 Bachmann Engines that have DCC.  I want to add sound. Neither engine has a DCC board that will accept a 'plug in'. Where do I go from here ? Can sound be added ?

[the Bach-man]

Dear Keystone,
What are the locomotives?
Thanks!
the Bach-man

[keystone]

Mr Bachmann
H-0 GP40 Diesel    Item # 60306
H-0 70 Ton Diesel   Item # 60607   

[the Bach-man]

Dea Keystone,
These locos have the decoder built into the board. I'll have to defer to folks with more experience to guide you here. In the meantime, I'll ask around.
Have fun!
the Bach-man