I have been testing different CV settings on my drop in airwire decoder in the Bachmann C-19 and have discovered that if you use the “cruise control” feature you need to make sure the “bump” feature is turned off or at slower cruise speeds the “bump” will try to kick in making for very poor operation. I talked to CVP and they knew it could be a problem so they now recommend turning “Bump” off while using “Cruise control”