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Previously Ardour only announced processor latency. Routes that had additional latency to compensate for those have not published this delay. This is of no concern with internal backends, however with JACK, Ardour reported incorrect *individual* port-latencies of routes that perform PDC. Since public port latency now includes delay-compensation, some extra work is required to unset it before recalculating latency of paths that include external ports.
Please see the Ardour web site at https://ardour.org/ for all documentation..
For information on building ardour:
https://ardour.org/development.html