This is probably a daft question but as I don’t know the answer I’m going to ask it anyway. I have two tender drive Hornby A3’s which I have converted to DCC with a Sapphire decoder to cope with the current draw of the ring field motor, both models are in excellent condition and I don’t intend to replace them, though I’d like to fit sound, so, if I was to hard wire a TTS decoder to receive current from the track but leave the grey and orange wires isolated, then set the TTS decoders accel/decel etc the same as the Sapphires and the create a consist using the two decoders would that work? I’ve thought about it for some time and in my simplistic way of thinking it would work, but I stand to be corrected.