Are you looking for each folder? Or just the sound files themselves that are 'default'?
Sketch: I think your other thread answered a good bit of this, but here is what I am looking for (and what I think Scipio is looking for) is the actual file names for every sound and what the number of variants for each filename is. For instance, as you pointed out, there is a 20mm_1, 20mm_2, 20mm_3, etc. Can you have just a 20mm? How high can the 20mm_# filenames go and still be used (as an example)?
I also was looking at the settings folder for the sounds.cfg. It appears to have a listing of many of the sounds. However, it also has some blanks spaces. Does anyone understand how this file relates to the sounds used in the game (other than settting the folder)?