It helps when you provide more information as others have suggested.
Here goes with the little we have.
The NEM651 is commonly used in N scale locomotives. As such the decoder is likely to be a Zimo MX648 or MX649, small format sound decoder. Similarly, no problem in programming the address. I use NCE as well as DP.
On Mon., 9 Dec. 2019, 16:38 , <forfoum@...> wrote:
Quite possible, CV7 will give us an idea where it stands.?
Unless Robert can tell us what specific Zimo decoder it is.? NEM651 is of no help.? Must be MX???? or similar.? MAybe tell us with specific ROCO engine it is and we can fish for details.
Could also be as simple as adding the decoder in question to the list.?
At present CV7 = 37 is the highest value in definition file.