No locomotive and track sound effects after 45 MPH on SP2?

I just installed SP2 and everything seemed to work dispite some scary stories others has patched. I just noticed however that locomotives no longer give off air pressure and air compressor sounds anymore. Also, I noticed that once I bring a train above 45 MPH, I no longer hear the track effects, just the default clicking sound in Trainz. How do I fix this problems?

(Correction) SP1... It was late last night when I created this post.

SP1 has some sound issues, the developers are aware of them. All we can do is wait. One thing you can try is going into the options in game and doing something with the sound settins. Slide them up or down, toggle 3d sounds, sometimes just opening and closing the menu will bring the sounds back. Until they go out and you have to repeat the process.

I was running a session when the sound stopped. After watching for awhile with no sound I switched to map view and the sound came back, strange.

Rob

I can make the sound start back up by swiching to/from in cab.