Hi since there seem to be some knowledgeable people in the house I have a tough problem for you: Imagine the following scenario: An application A registers a BMidiConsumer at the midi_server. Another app B connects a BMidiProducer to the consumer and starts sending Midi messages to the producer. Suddenly app A crashes. How treats the midi_server such a situation? I think it survives the app crash. What happens with app B that still wants to send messages to the consumer of the now not existing app A? How realises the midi_server that a registered BMidiNode has "died" because its app has crashed? - Michael PS: I am just curious and don't intent to implemend the midi_server. PPS: the media_server and maybe other servers have to solve or have already solved similar problems.