This is the procedure I have used in the past to turn if off and on.  I just walked through that procedure to confirm and it does not turn the sound on anymore.  The train however will move forwards and backwards.  I can also turn the headlight off and on using the 10 button while in the Function mode.

The loco says that if I'm using the Bachmann engine with the EZ Controller there is nothing to reset since the controller cannot send anything to the engine.  Which is funny because how can that work with programming the DCC to a different control number.  Anyway, I think I may just take it to a local hobby store and see if they can reset it.  I'm really stumped.

Everything works but sound.

OK that is what I thought.

If I do a function 8 on my controller nothing happens as far as sound goes.

Is there a way to completely reset either the DCC controller of the train it self it a strange combo of buttons had been pushed?

OK dumb question.  If the train is on 3 and running do I just push the function button and then 8 or do I hold down the function button and press 8?

I've had this Thunder Chief set for a while.  The other nice the sound stopped working.  Using the EZ Commander.  The locomotive functions fine.  I've even programmed it to a different address which worked perfectly but for the live of m I can't figure out how I've disabled the sound.

Any information will help.