Gig Performer 4.7, released recently, includes a new Streaming Audio File Player that supports timelines and actions. That means that you can play a backing track and have "things" (aka actions) happen automatically as a song plays. Typical actions include the ability...
OSC
Using MIDI OSC blocks to send MIDI to the Global Rackspace
As of the time of writing, Gig Performer 4 does not support sending MIDI messages from a rackspace to the Global Rackspace or vice versa, you can only send audio data. Although a future version will most likely add this support (legal caveat - no guarantees), there...