Another route to travel down in terms of warming up and "de-digitizing" synths sounds is to go with single ended noise reduction. An example of that is the DBX 929 card for their 900 rack.
What I've found is that the same frequencies that are addressed for noise reduction are the same general frequencies that give digital some of its less desirable sonic characteristics. Roll those off a bit and you get a lot more "analog" sound.
Noise reduction is a bit different than eq, and I've found noise reduction circuits to create a more pleasant sound.
The noise reduction has to be single ended, and ideally it's something you can dial in the amount. I'd also stick with DBX or Dolby, but I'm sure there are other products out there. Just a thought.