I would also review this https://mthtrains.com/sites/de...20DOCUMENT_FINAL.pdf
Again, step 1 for a PS3 steam upgrade kit install, load the correct chain files. In this case, I know from your original question this is a premier steam with normal large smoke unit (not the small ones like used in certain engines).
https://mthtrains.com/sites/de...am_Osmk_3528-CPF.zip
After you have uploaded that using consumer loader- yes it will still beep for one cycle. This is the normal chain file loading process. That said, it will go away once it power cycles and finally completes proper loading of the chain files.
Read this topic about beeps https://ogrforum.com/...e-won-t-stop-beeping
Again, in that above topic, @GGG did a great explanation of the beep codes and the process of how it should work in this post https://ogrforum.com/...7#152899749149831697
Step 2 is load ONLY the sound file from your new sourced sound files. Do not also load the entire chain file package- those chain files are for PS3 OEM steam which is the tender and boiler board style system and thus incompatible with PS3/2 stacker. This requires unzipping the packaged file as downloaded first to isolate the single *.mth sound file.
For this engine, one possible sound file is from that page https://mthtrains.com/sites/de...ction%20final_3v.mth
It's a PS2 3V 1meg style of sound file, so yes an upgrade over original protosounds, but remember you can use newer PS3 files and thus larger 4 meg premier sound files.
Also, looks like we might be able to choose an engine with either Passenger or Freight announcements, and get quilling whistle
O Scale Premier FEF Northern Express
Reefer Set w/Proto-Sound 3.0
Union Pacific
FEF Northern Express Reefer Set w/Proto-Sound 3.0 - Union ...
O Scale Premier FEF Northern Streamlined
Passenger Set w/Proto-Sound 3.0
Union Pacific
FEF Northern Streamlined Passenger Set w/Proto-Sound 3.0 - Union ...