I downloaded and installed a newer soundset for the Challenger. I believe it was from this 22-3684-2 | MTH ELECTRIC TRAINS (mthtrains.com)
When I activate the playable whistle, it plays a loud screech!
I did not change the chain files so I don't know if that would help
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FWIW I may have seen this before myself when trying to change sound files. Think of it like this- chain files is the operating firmware and as such a function points to a memory address. The idea is the sound file matches that address. However, if say they changed that scheme of what sound file memory location to a given function call, or as features were added and sound functions added it was different, then you could get the exact problem- a function calls an invalid memory location and you get bad noise.
So yes, I would use matching chain and sound files.
Now catch22. I know that there was the EMI compliant boards VS non-compliant EMI boards, and that newer chain files are backwards compatible, but old chain files on an EMI-compliant board is to be avoided. EDIT per John, Very bad things can happen on a steam boiler board that is EMI-Compliant version (newer) and putting old chain files from a non-compliant era board based engine.
FWIW, while trying to research more details, an important chain file flashing process note from @GGG
If you get the wrong mix of old files on the EMI boards, you'll suddenly get a major current draw and the motor won't run! It apparently turns on both directions at once, not a good thing!
Well, so far everything else works?
another 2 rail UP grey Challenger to work on... | O Gauge Railroading On Line Forum (ogaugerr.com)
Fixed. Swapped out the chain files! Thanks.
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