You can manage how loaded sound will be added to the existing editing session through a previous call to the SetLoadingMode method.
You can limit the range of sound data that will be loaded from the given sound file with a previous call to the SetLoadingRange method.
During the execution of the loading session the CallbackPercentage delegate is invoked, with the nOperation parameter set to OPERATION_SOUND_LOADING, in order to notify about the percentage of advancement of the loading session.
For further details about callback delegates see the How to synchronize the container application with the API tutorial.
For further details about the integration between Audio Sound Editor API for .NET and Audio Sound Recorder API for .NET, check the How to load and play sounds recorded by Audio Sound Recorder API section.