Trailing A unit does not respond to volume controls

does it have a volume pot and is it connected?  Do you use DCS?  It should respond to DCS volume control.  G

Yes it has two pots that were added in the speaker cover and the wire run up through the chassis and are plugged into the board. Yes, I am using DCS but it does not respond, I am trying to control the sound volume while the paired locos are on the track and it seems that only the leading unit responds to volume changes. Do I have to maybe do each engine separately before I pair them? For what it is worth the person that I bought them from said that you (GGG) did the upgrade so I am confident that it was done correctly

I would separate the engines from MU/lashup, and test it separately.  If sounds all work it eliminates a hardware failure.  At that point I would assume it was silenced or it is a lashup issue.  G

Thanks, I did separate them and it functions as it should so I am sure it is a lash up issue. I got out the DCS companion book and will try to follow those instructions and see what happens. Thanks for your thoughts.

Resolution, I was not using the FVS button after making changes to the settings so they never took effect.