Originally posted by Gregbva Hello, Where do I adjust the CV 120 for horn volume, CV 121 for bell volume, and CV 122 for exhaust volume. On the Digitrax Transformer mode on the program track? I can change decoder numbers, but never did anything else. Thanks, Greg[^] [/quote You should read your Zepher manual. Section 16 explains about programming the decoder. If you haven't already downloaded the manual for your decoder from Soundtraxx, definitly do it. It will explain each CV and their purpose. Let me know if this helps your problem. Dave GO GATORS !! Old layout http://photobucket.com/albums/v491/davegator/ New layout http://smg.photobucket.com/albums/v491/davegator/New%20Layout%20Building/ Reply Subscriber & Member Login Login, or register today to interact in our online community, comment on articles, receive our newsletter, manage your account online and more! Login Register Users Online There are no community member online Search the Community ADVERTISEMENT ADVERTISEMENT ADVERTISEMENT Model Railroader Newsletter See all Sign up for our FREE e-newsletter and get model railroad news in your inbox! Sign up