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Since control-ports have a fixed value for the current process-block, Ardour splits a plugin's run() process cycle on every automation event to facilitate sample-accurate automation. Since automation is interpolated between events, this ensures that each explicit automation point is reached (not interpolated). Plugins where this is not required and which favor a fixed block-size, can now specify an optional Feature: NoSampleAccurateControl. One example: a convolution plugin with smoothed gain control.
Please see the Ardour web site at http://ardour.org/ for all documentation..
For information on building ardour:
http://ardour.org/development.html