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Audio+MIDI tracks were just MIDI tracks with an additional audio input, and do not directly allow use of vocoders (an instrument is loaded by default). For pitch-correction or similar use-cases one would prefer an audio-track (main data) with MIDI only being used as control-input. Ardour 5/6 pin-connections and side-chain offer a much nicer workflow for this setup. Alternatively one can get those tracks-types by manually adding an input port to an existing track, and creating a custom template.
Please see the Ardour web site at http://ardour.org/ for all documentation..
For information on building ardour:
http://ardour.org/development.html