I have the 5003 & 5008 Bachmann CP engines. I set them to DCC with their corresponding engine numbers -- now I want to switch them back to just DC.
Please help me to do this. I am using MRC Prodigy Advanced Squared
Eldon

I want to consist this engine with  an Intermoutain Emd F9B # 4959S loco with a QSI sound .
Both units have different speed ratios-- would welcome suggestions on how to consist both of them together so that I do not overtax one engine over the other

HO RTR GP35 w/DCC, CPR/Multimark #5003
Specs
DCC:Yes but no sound on board
GP35 DCC Equipped CP Multi Mark #5003

I programmed my GP 35 Diesel using my MRC Express to run on my DCC layout.
How do I deprogram the engine to run on my DC HO layout?

What DCC and Sound card will fit into this model ? or can I just keep the original DCC and add sound by using another card?
I also have the 5009 and 6550 models as well.
DCC-Equipped EMD GP35
CP Multi Mark #5003

I have the Bachman CP Diesel 5006 DCC engine. Can I add a sound decoder to this unit? If so, what make and model? If not, do I have to replace the DCC unit with a completely different unit ??
Would the same advice apply to my other diesels 5003; 8205,8210??