I've taken a look at the requests to use Geco to trigger notes, and wanted to throw my support in for this, too.
I'm working on putting together a sample library based on sonic metal sculptures that are "played" by brushing ones hands over elements of the sculpture. I was hoping to use Geco and the Leap controller to mimic the way these sculptures are played in the real world.
There are not scales, per se, and not notes, just distinct sets of sounds created by separate sculptures. The idea was to "place" sample sets from a number of different sculptures in the Leap controller's space, and to be able to hear the sculptures' sounds through gestures made in 3 dimensional space.
I am not terribly proficient with MIDI - perhaps there is a way to accomplish this now, but I can't quite figure it out!