I made guitar tabs for "Moving Very Slowly" a while back. Not sure how helpful it will be for bass, but hopefully it will give you the basis of what you're looking for. You can find it
here.
As you can see, it's formatted a bit differently from a normal tab. It's got two parts: the "map" of the song (its real name escapes me at the moment), which will show when to play each part and how many times, and the melody. which is the actual tabs for each part. I included the beats in the tab as well, which, at least for this particular song, is very useful.
Hope this helps.