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The connection was stored by the Port where it was initiated from: 1. Connect A to B 2. Disconnect B from A (1) Port A remembers the connection to B (2) Port B does not know about the connection from A Since disconnect is initiated on port B, port A still retained the connection information. When restarting the engine, Port::reconnect() reestablished the connection. This is only relevant when libardour's own connection information is used. e.g. the session is closed without engine, or when re-starting the engine while the session is open.
Please see the Ardour web site at https://ardour.org/ for all documentation..
For information on building ardour:
https://ardour.org/development.html