Here's another method of A/B'ing that also ensures latency free, glitch free listening and for comparison's sake, that is what you want. Just bounce to a stereo mix each rendition. So, dry/unaffected, then Neve version, so on and so forth. Then group/invert solo each one versus the dry, then you can do them against each other as well.
Ah yes, and check out Dean's shootout!