For the record, a number of other things have changed in the obeslisk audio:
1) The temporal length of all bars has increased by around 20%.
2) The temporal length of all sparse-spaces has increased by around 20%.
3) The end-of-packet sequence has increased from 12.46 seconds to 16.13 seconds.
4) The frequency extent of all bars has changed a bit. In particular, L bars were shortened and N bars were lengthened.
5) The adjacency rules are still the same (i.e. like-bars don't like being right next to each other).
Additionally, I've found that it's a bit easier to automatically extract data packet info. When I first had a look at obelisk audio in the Beta, I thought these were all arbitrary changes, but I'm starting to think otherwise. This could all amount to nothing, but
perhaps the fdevs are setting the stage for a viable gameplay mechanic here.