883ee9c2a0
Delaylines are not saved in the XML and internal-return is an invisible processor not explicitly re-added when the state is restored. They are [re]inserted during Route::setup_invisible_processors(). So this method need to be called after restoring processor state (indirectly via configure_processors_unlocked as needed). PS. During route creation this call happens explicitly and on session load hookup_io() -> Route::output_change_handler() implicitly sets this up.
Please see the Ardour web site at http://ardour.org/ for all documentation..
For information on building ardour:
http://ardour.org/development.html