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Ardour 6 internally always runs at speed 1.0 (or -1.0, or stopped 0.0). There is no vari-speed that scale "BPM" or "n_sample" time progression per cycle. Instead Ardour 6 vari-speed mechanism transparently re-samples I/O. So process-time is scaled only relative to wall-clock time. From a plugin's POV this is similar to "freewheeling": The plugin processes data as if the host plays at speed 1.0. While the host plays this data at a different rate. Some plugins may like to be informed about the host's actual playback rate. Currently this is mainly for the benefit of github.com/x42/repitch.lv2.git
Please see the Ardour web site at http://ardour.org/ for all documentation..
For information on building ardour:
http://ardour.org/development.html