What I didn't understand is how would I add a third animation, for instance a 'stand' animation. This animation would interpolate with the 'walk' animation in your example and it would not affect the 'shoot' animation. What came into mind was nesting playerTweeners but it didn't work out. Everything would be simpler I think if there was some way so that each animation only affected the bones specified in the editor without the need for a baseBoneName.