Hi, finally I found openal ! :) The fresh blender- cvs builds, but there is still a bug in the Python API. In the scripts yable (Yafray exporter), the following code fragments fails : if xRes > yRes: aspect = 1 else: aspect = float(xRes) / float(yRes) focale = cam.Lens / (aspect * 32.0) <<<<---!!!! "Lens" is not found. Kind regards, Meino Cramer