Hi,
At first, I thought this is the terrainmaker's fault, but now I'm almost sure that it's a tool/engine related issue:

Usermade terrain/islands has inappropriate environment data (soundcontrollers), meaning that this awesome sound system implemented with EDEN update only enjoyable on the three official terrains (Tanoa, Stratis, Altis).

The problem is not in the used models config. I.e. tree models were set as trees, houses as houses, etc.