I did a search and could not find an answer. I have a GP38-2 sound value and would like to have the sound stay off on powering up the layout. I know this can be done with Tsunami 2 but was hoping to do this with the SV decoder. Also I see that Soundtrax has replacement decoders for this engine, but the cost is as much as I paid for the GP 38-2. Has anyone tried fitting an Econami decoder in this engine or another Bachmann diesel with good results. This would save some $.