The state method has an optional delay argument to specify how long it will take to fully blend in the new state and blend out the old one to give a smooth transition. In the following, press the spacebar and after 2 seconds animation 5 will be blended in.
Code:
import viz
viz.go()
male = viz.add('vcc_male.cfg', pos = [0,0,5], euler = [180,0,0])
male.state(1)
vizact.onkeydown(' ', male.state,5,2)