Sorry, the 
CSR sounds are 
not at all compatible with this thread's LFS sound engine (shift-A) 
.eng files.
 
The reason is, CSR uses sounds samples that are quite long 
.wav files, some up to 500KB, 3-4 seconds. 
On the other hand, the 
.wav files you can import into LFS and make up 
.eng sounds are a lot smaller - around 10KB only around 0.2 seconds, very short bursts. Click the [S] button in the Shift-A menu in LFS you will see what files are required when you export a 
.wav from the LFS engine editor.
If you want more detailed specs on the
 .eng editor 
.wav sound format, click 
here