6911702f21
If a route has strict I/O then the main delivery follows the output of the last processor, but libardour ensures it has at least as many outputs as inputs in the master strip. A good consequence is that mono tracks get their expected panner. An akward side-effect is that MIDI-only routes (e.g. midi tracks or busses without a synth) get two audio channels that have no use (and indeed no panner is added because there is nothing to pan). Skip the completion of audio outs if there was no audio out to begin with.
Please see the Ardour web site at http://ardour.org/ for all documentation..
For information on building ardour:
http://ardour.org/development.html