Having finally got the hang of this new system, I installed a sound decoder into a class 73. Experience now shows that a stay alive cap is vital, as the slightest interruption of power drops the Bluetooth connection and it goes quiet. I now turn to the sounds. Back in the 70s, I used to do sound recordings on trains, sadly Hornby s attempt at the EE 4 cylinder engine does not sound anything like it should. Not only that, the horn has been programmed by a car racer. If any UK driver did that, he would be disciplined. I know you get what you pay for, but put this alongside a decoder from a well-known supplier and they are totally different. What have Hornby recorded? Once again, I applaud Hornby for pushing technology, but I'm more than happy with the old TTS decoders (I have 16 of them) Andrew