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The delay-time itself can change arbitrarily, but the buffer-size never shrinks. If the buffersize grows it means that the new delay is longer than the current one (or at least as large as any pending, not yet active delay). This is important for the mechanism that adjusts the read-pointer to the new buffer-size.
Please see the Ardour web site at http://ardour.org/ for all documentation..
For information on building ardour:
http://ardour.org/development.html