Can confirm the Audiotrack thing i asked about.
You can do stuff like:
A = Avisource("myvideo",atrack=0)
B = Avisource("myvideo",atrack=1)
A.Mixaudio(B)
(Hope i did that correct now).
Such a feature i have been waiting a long time for, and i thought it wasn't possible as i asked about it.
Very thankful for it to have been implemented
