Interesting Problem With G-Trax's SP GS-4 Pack

I think that the airhorn on G-Trax's SP GS-4 Pack no longer works outside the cab using the Q key and I think after TS2013 came out I think that it messed it up.
https://www.railworksamerica.com/forum/
https://www.railworksamerica.com/forum/viewtopic.php?f=29&t=9668