Hi again,
I respond to myself: the problem come from compiling the "all" part of the project and never run the standalone and audiounit version of the plugin.
Still dunno if I'm stupid or if Xcode is!
After this it still refuse to compile (cycle error ...) but changing the build system from "new build" to legacy build in "file / project settings) solve the problem.
The last problem to resolve is the dead UI when using the AUV3, but the sound work!!
Cool!!