Will my Beovision 3 with stb module control a Humax 9200 PVR?  There is an earlier model Humax box listed in the menu, but I don't know if the codes will be the same?

Whilst the 9200 is not currently in the STB controller list you may wish to try it with earlier box settings for two reasons:-

1. Manufacturers tend to use the same codes from model to model just adding new codes where required
2. Often the core everyday functionality remains the same from one model to the next

Update - no, the STB would not control the Humax, but I successfully achieved this with a Lintronic box.