Tell Me about it Neil and buff makes two versions of the 43 one with one chip and the other has 2. And both are different if your goin one way only the unit at the front sounds it's horn. I help charlie out at the small exurbitions in turn for coffee and cake. So I have the pleasure of the 43 but my all time best has to be the 37 4 I was talking to biff at York and he has got some more 37 sound do hopefully a new set of 37 4 will be available soon.