Thanks Ray and Vernon. Ray, I look forward to your post. Vernon, I used TR07.
A side note: A few years back I had no horn on a new set of Third Rail E8s w/ERR. I could only get them to work was by using the old TMCC antenna controller. Again, all other sound features worked just fine. A year later, for no apparent reason, the horns worked with the Cab1L and still do today. Who knows?
Earl