The distortion effect suggestion is a good one.
But the REV2 is not a polyphonic Moog. The Prophet 6 would be a little closer in sound to it than the REV2, in my humble opinion.
The OB6 is much closer to my Minimoog D (as far as fat goes, whatever that is lol), than my REV2.
But that's not to say that it can't sound rich, too. Careful programming, and attention to details (don't forget that Slop parameter) can yield very good results. You just have to "work" a little harder at it to obtain satisfaction than on some other synths.
The REV2 doesn't offer the instant gratification of an OB6 or Minimoog D. But it is a very powerful synth nonetheless. Use the matrix (no, not the Oberheim Matrix-6, the onboard modulation matrix). BTW, the Oberheim Matrix-6 also "suffers" from the same "this is not a Moog synth" behavior. Probably because it uses the same Curtis chips based oscillators and filters as the REV2.
Only a Moog is a Moog. And even then, some Moogs are better than others at being "fat".
There a guy in France who was tired of waiting for Moog Music to produce a modern polyphonic synth, and created his own, based on clones of the Moog The Source, of which he put 8 of them inside a box and added modern digital controls and software. His company name is called Baloran and the synth is called The River.
Having heard it, it sure sounds like a polyphonic Moog, because it IS. Unfortunately, it is a One-Man company and he builds them by hand, one at a time, and he's flooded with demand despite the price tag (around $5K). He's currently building the first batch of 20. And, no, I didn't reserved mine yet because of shipping concerns...
Just search Baloran in google.