e87b989501340e8abf6477ed1945d9502f2827b1
When not using inplace processing (because I/O pins connections are not an identity matrix), dedicated inplace-buffers are used. Those buffers contain silence on unused ports, and hence always valid to use. However it is still useful for plugins to know if a plugin-port is actually used. VST3 can disable busses for unconnected pins.
Please see the Ardour web site at https://ardour.org/ for all documentation..
For information on building ardour:
https://ardour.org/development.html
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