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Basically, I agree with what Randy said. I have a BLI NW2 and two Lionel Challengers, all of which have the QSI sound decoder. None of these would program directly with the Prodigy Advance. In the BLI locomotive manual (as well as the Lionel manual) there is a "Procedure for Entering Long (Extended) Address in CV56.129 in Ops Mode." This procedure is found in the section "Special ID Programming (CV 56.129)." In my manual it is on page 37. Here in the manual, the process Randy stated is explained. When correctly followed, it works well. I don't recall where I programmed my locomotives, but I believe they were on the mainline when I programmed them. This process is a little more complicated, but does work well for me.
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