To add on to the first reply , the most important thing to remember is you can't mess things up, so experiment.
you can always set the cv3 and 4 values back to 0 to get what you have now, so don't be afraid to experiment.
Depending on what DCC system you have, if you can do programming on the main , its a bit more convenient in that you dont have to go back and forth to a programming track, but otherwise what I tend to do is start quite high and try lower values each time till I get the effect I'm after.
On a big US steamer this can be 35 or more, but its all down to personal taste and the motor and the decoder combination.
Try some numbers, as said, you can always reset the cv's to zero(or whatever the manual says is the default value on the decoder), so you can't really do any harm just changing those 2 cv's.
you can always set the cv3 and 4 values back to 0 to get what you have now, so don't be afraid to experiment.
Depending on what DCC system you have, if you can do programming on the main , its a bit more convenient in that you dont have to go back and forth to a programming track, but otherwise what I tend to do is start quite high and try lower values each time till I get the effect I'm after.
On a big US steamer this can be 35 or more, but its all down to personal taste and the motor and the decoder combination.
Try some numbers, as said, you can always reset the cv's to zero(or whatever the manual says is the default value on the decoder), so you can't really do any harm just changing those 2 cv's.