More Ken

If you look at the Ken bau page of the Vietnamese Musicology Institutes homepage the picture shows a man playing a ken without a lip-plate and with the reed between his lips. The design is more like Khanhs instruments than other pictures of the ken bau I´ve seen. The text is about the Ken in general and not about any specific style of instruments. The homepage is quite poorly translated into English so this could be a reason for the mix up, or maybe you could use the name Ken bau for any Ken, even though I´ve never heard it used for anyother than the court music Ken.