Thanks to NCE Super User - Dave Heap for help on this topic.
***Important Note** For the Powerhouse, Power Pro, PH-Pro, and CS02, you must use OPS mode programming / (POM) Programming On the Main for making indexed CV changes. If you have a Power Cab system, there's no problem. It doesn't have a firmware problem.
Soundtraxx video on YouTube - https://www.youtube.com/watch?v=nv2XFr60zwg
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Think of a row of 3 file cabinets. Each unit has say 4 drawers, 1-4. You can;t just sya the item you want is in drawer 2, there are a total of 3 draw #2s, one in each stack. You need another coordinate or an index - row 2, drawer 2, then points to a specific drawer to locate your item.
People are always making this out harder than it has to be. CV257, for example, can refer to three different things. The index simply sets which of those three things you are referring to. If the option you are trying to configure says it's controlled by CV 2.257, you set CV32=2 and then configure CV257. If the setting is CV 3.264, you set CV32=3 and then CV264.
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CVs with a dot in the number (1.300) are “Indexed CVs,” which is a fancy way of saying they are really a group of three CVs that need to be changed like a combination lock.
The first two numbers “unlock” the CV you need to program. The third number is what you are changing.
- Ensure CV 31 is set to a value of 16.
- Enter a value of 1 into CV 32 to select Indexed CV Page 1.
- Select CVs 257-512 from your command station.
From page 13 of the attached Soundtraxx manual:
Indexed CVs The term “indexed CVs” tends to cause confusion and consternation. Indexed CVs are located on ‘pages’ to help manage the total number of CVs. The NMRA DCC Standard requires this and works like this: Indexed CVs are accessed using two CVs: CV 31 enables indexing when set to a value of 16 (the default value), and CV 32 selects the desired indexed page. You do not need to type “1.” Into the command station when programming indexed CVs. Because of the features and options in Econami decoders, three pages of indexed CVs are provided: To access CVs 1.257-1.512: 1. Ensure CV 31 is set to a value of 16. 2. Enter a value of 1 into CV 32 to select Indexed CV Page 1. 3. Select CVs 257-512 from your command station. To make things easier, Econami CVs are grouped by function as follows: CVs 1.257-1.512 are used for configuring Flex-Map function mapping CVs. CVs 1.257-1.384 are used for function mapping CVs, and CVs 1.385-1.512 are used for automatic effect configuration. Refer to “Configuring Function Mapping” for more information.
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