View MIDI information within plug-in host?

In “Tutorial: Create a basic Audio/MIDI plugin, Part 2: Coding your plug-in”, the end of the tutorial says to “run the plug-in in the host environment and you will see that all MIDI note on signals are coming through our plug-in have the value set with our slider.” How do I actually view MIDI note signals within the host environment? I could add code to my xcode project to print info to the console, but is there a way to easily view this information within the host itself?