I think you're ahead of me here, I'm not sure about the muscles. I have used Poser format mocaps for a long time (Eclipse Studio, PoserMocap), in many cases with little or no adjustments. B-{ I have more recently been using the NLA with clips from imported Animate files, and yes, lots of flexibility. I also have some M4 Muscle Morphs which I've been trying to find a use for ... I really do like to avoid dialogue, and one way is to have the actors use expressions and body language.