NAT can't currently deal with auto release. I've had great results with the nebula program + algo method. That is the idea behind my LApreA Gain Stage. Being a stereo unit as well, it's great on for many coloring tasks.
I actually like the CLA as the algo back end for this task because it has the R37 control available, occasionally useful; haven't had a chance to try out the IK yet. But yeah the LA-PreA is great for this, it gets a LOT of use around here.