I had a similar problem - had no voices but other sounds
I think mine happened either when I changed voices to German or changed time compression thru SH3commander
Try removing SH3 commander first ( after rolling back )- if that doesnt work then try the following
Change the name of your SH3 install from SHIII to something different ( lets say SHIII Old )then delete the SH3 folder in my documents - best you move your current career out first
Then insert your SH3 DVD\CD and choose repair option
When its all installed - replace your career into the new SH3 folder in my documents
Reinstall SH3 commander and point it to your original SHIII install ( SHIII Old )
This way you will still have all your mods installed and its the way I solved mine
Plus you get the benefit of having a new install of SHIII for you to patch and then mod as you like or at least have access to original files if you should ever need them
