I just purchased a on30 Heisler with sound. Runs and sounds great. Problem is-Both lights are on at the same time in either direction. Can someone help me get the lights to work properly?

I have a on30 shay that is too loud and I got a answer  as to lower the volume with with cv changes.  I need a step by step guide on how to do this?  Anyone with help would be greatly appreciated. Joe

I have a question: is their a way to turn down the volume on the on30 shay? If so How do you do it??
Thank you Joe

I have all the 0n30 engines with sound and they are great. I want the new 4-4-0 but it does not come with the sound installed. Does anyone have a answer and how to do it? Thanks, J&Ts Rustic Rails