Nigel, thanks for your help. The reason for the query is because they are referred to in the manual for the new Dapol/Rails Class 88 sound fitted loco. The function of each is as follows:
CV981/2/3 variation of flange squeal between light and loaded engine.
CV984 Cab door closing volume
CV988 Traction motors volume?
CV990 Variable delay between pantograph contacting OLE and startup of motors.
I haven’t contacted Dapol regarding how to access these scripted CVs in order to change them. Maybe a call to them will help? Any help you could provide will be most appreciated.
@BraunshillDavid