No submarine sounds
 

I recently got the Foxtrot+November add on.
The foxtrot which is a diesel electric sub worked fine. Everything including sounds worked. Then I loaded up the November which was Russia's first nuclear submarine class. Once again a nice model, but the sounds for it don't work. I mean none. No interior sounds, no torpedo door sounds, no propeller sounds.

I tried both the SDL file provided with the mod, and the RFB's SDL file. I even tried using the DSD file from the foxtrot renamed for the November.

No luck, the sub is completely silent.

Any ideas what could be going on here.