Finally managed to find a video converter to compress the AVI files to a more manageable size for upload.
Here's the lady on Erhu hand syncing:
The lack of microphones and pick-ups gave her away.
Here's the lady on mouth Dizi playing live:
Here's the whole lot of them hand syncing:
But I do believe all of them are able to hold their own. Perhaps they cannot play live because of the lack of proper equipment.