Hang on a minute, I'd forgotten about a hack I did of a script by svdl. This script only saves data for valueParm (FBM) channels, or at least that's what it's supposed to do, my Python skills are very minimal so I can't absolutly guarantee it will always work correctly, but it seemed to work OK for me. It may be closer to what you are looking for.

 

You will need to loose the ".TXT" part of the file extension.