At last someone actually understand what I was talking about. DUNE 2 is indeed free-running but totally random. Spire is way different with its ANA switch behavior. A more consistent, pleasant, phase randomness. It's not possible to achieve that with DUNE 2. I've tried everything, including things suggested in this thread and others, and nope, nothing works.
Here's an audio example, first 4 bars of 2 oscillators on Spire (with ANA switch), and then 4 bars of 2 oscillators on DUNE 2:
https://dl.dropboxusercontent.com/u/29540382/phase.wav
The behavior is totally different.