Hi Steve,
The calibrate feature will allow you to set the meters on the Central Station to be with .5dB of whatever DAW you are using. Since different DAW's track a clip at 0dB differently, it will allow you to match up the meters without having to open the unit up and tweak a pot.
Click here and scroll down to "downloads"
If you are still having any issues, please email me directly and I'll be glad to help.
Hope this helps,