Sorry I couldn't find a active thread for them so I though since they are both small breeds it would be similar. I've tried Youtube. There is barely one page of videos of them on there and they are silent in every single one. I know the females make noise but I'm just dying to know how loud it is.
Calls were originally bred for their loud voices to aid in hunting. East Indies were not so I can't imagine that their quacks are anything close to a call. I've never had one though so I could be wrong.