So, can we play the Leap now? We absolutely can! There is a wealth of free and trial music software available for generating all sorts of noises a quick Google search away. You should be able to select the Leap MIDI control device in your music program's settings, and use its MIDI learn feature to map your ball radius gestures to anything you desire (filter cut-offs, effect parameters, and synthesizer knobs are especially fun).
This is all well and good but there is one very serious, unaddressed issue with our MIDI controller: blocking. The sad truth is that our code is not ready to be used by the general public to give performances because the gesture response time is utterly nondeterministic. In the onControlUpdated() routine described earlier, our call to MIDIReceived() is part of a poorly documented API that may or may not involve communication with blocking subsystems or hardware, and that frankly we know very little about. Depending upon the user's setup, hardware...