This response if from our staffer Ian who transcribes Rob’s videos for us:
“The Great Dobro Session tab for Fireball Mail is written in a cut time signature and ours is in 4/4. Cut time or cut common time is 2/2. Our tablature is in common time which is 4/4. In cut time, 16th notes become eighth notes…if the cut time signature is 2/2, which it is in this case. It’s a bit of a confusing concept, but essentially all of the note values are cut in half.”
Perhaps this video will help.
Hope that helps!