I created the Original Engine Telegraph Sound Mod for SH3:
http://www.subsim.com/radioroom/showthread.php?t=103418
It was quite time consuming (and is why I only made the german voice version). All I did was use a sound merging utility to merge the bell ring with the 9 different Chief Engineer Voice Files created for SH3. So, everytime the Chief Engineer would say something related to engine speed a crank and telegraph bell would ring at the end of his voice file. It requires editing all the sound files for each voice mood. In SHV there is 4 different voice moods: Normal, Normal Depressed, Tension, and Whisper located within the ChiefEngineer folder. All the statements relating to speed will have to be edited for each of these moods for it to sound consistent throughout the game.
The originals files I edited for SH3 were located in:
...\data\Sound\Speech\ (folders 1-9 for all german voice types)
The files for SHV that need modified for this to work are located in:
...\data\Sound\Speech\ChiefEngineer\
These are just sound files so you can use them in both versions of the game. Just the SH3 voice actor will not sound right with the SH5. It would be best to reedit all the sound files of the new voice actor. It can be done it just will require alot of time and patience.
I would do it if I thought it was worthwhile or if format stayed the same from game to game. But, Im sure SHVI will be released soon and same overlooked problem of a silent telegraph readdressed. I still have the original bell and crank sounds I used for this mod as well as the software I used on back up drive. If I get some free time I will try to make a new version of this mod for SHV. I'm really enjoying the new walkaround environment of this sim.