Hi Like most of the posts on this thread, I too have tried on numerous occasions to contact Mr Casey at JJC, with the same result ( nothing).
I have

both sound unit and smoke unit in my boat, both connected to the throttle channel, and although either one would function by itself together they both behaved erratically.Initially I was asking for help/guidance, and after I cured the problem I tried to give some positive feedback.
I have been told, and I don't know exactly, that Mr Cary works for IBM and as such is out of the country for periods of time.
The success of his hobby, I think, got a bit much. I do agree with some of the previous posts however, it is not very nice to just ignore all communication, it leads to many irate customers (both existing and prospective)

.
The horn unit I was trying to get to go with the sound unit is no longer needed

. I build one of my own and fitted it, and it only cost me £11.50 for the parts :).
Cheers