This video shows you the basics of working with multiple input and output instruments plugins. That is, plugins that can independently play more than one sound and output them on separate mixer tracks.
In summary the principles are:
2. From within your plugin route individual sounds to its independent outputs.
3. From within your plugin set the MIDI channels it will receive on to play these sounds.
We're sure this will help you to get a lot more out of your multi-input/output plugins.