your second end

your second end

No doubt I've been looking at it too long, but I'm not seeing the problem with any of the end's.

end, should be end

According to http://www.lua.org/pil/3.6.html, trailing commas are valid in Lua.  I tried deleting it anyway, but it didn't make a difference.

go back to how daz says to do it that example I posted was working when I tried it, they may have done some changes I can't get it to work properly.

You are trying to do it the old way, in your table your using the on_off but in your signal script your using state ,

Put your signal script back to how it was and use the already created table in the startup script and a signal like this

[mc.ISIG_INPUT63] = function (state)
   if (state == 1) then   
       mc.mcCntlFeedHold(inst)
    else
    --    do something else or not
    end
end,
DazTheGas

The name of the variable doesn't matter.  It's a function parameter and can be called anything.  But I tried changing it to "state" anyway.  No difference.