Polychord is also a MIDI controller! Here's a demo showing how you can play over your WiFi network using core MIDI and control Logic (the same technique can be used with Garageband, Ableton, and any number of MIDI compatible Digital Audio Workstations).
This video illustrates the quick steps you need to take. For a complete tutorial, see: polychordapp.com/midi.html
One interesting detail in this video is how we set up logic so that it receives polychord's MIDI on separate channels, automatically routing the signals to the different instruments.