I've recorded a police chase with police sirens. The sound of the sirens were on, but when I replayed the chase the sound was gone, but the rest of the sound effects worked. I've worked very hard on making that replay and I don't want to delete it because of a sound bug (that may can be fixed). Is there a way to fix the sound again? If there is a way to fix it... How?
Press the console key(~) and check for errors. It could also be that you forgot to turn off the siren. try recording a test replay and seeing if this happens to all sirens, or if this was a single occurrence.