With some expert help from Grant Muller I have successfully added the capability of synchronization with an external MIDI signal to the GMS. This feature opens up vast possibilities for performance and collaboration with the tool. To test the feature I sent external sync from Ableton Live to the GMS, which in turn routed note information back through the IAC drivers into Ableton to drive a VST FM synth. I started by live looping a few phrases from the sequencer including a bass line, mid-range arpeggio, and some heavily delayed FM clav, then put it together with a recycled beat into a two minute micro-track. Everything heard, except the drums, are notes output from the GMS via video stimulus.
GMS External Sync Test