Hi Paul, yes I did a reset of value 8 into CV number 8, and no difference unfortunately. Its not just the sound, the lights don't work and the loco doesn't run, as well as the Prodigy info sending LED flickering so I think it has failed. The loco itself is okay because it all functions with a Bachmann chip. I might drop the chip into Howes for confirmation but I think I'm one expensive chip down now!