This is a really cool project from Sarah Belle Reid, who wrote it to share it with us. She writes:
MIGSI (Minimally Invasive Gesture Sensing Interface) is an open source device for electronically augmenting the trumpet. The interface attaches to any B-flat or C trumpet and requires no permanent modifications to the host-instrument. MIGSI uses sensor technology to capture gestural data such as valve displacement, hand tension, and instrument position, to offer extended control and expressivity to trumpet players. This data is transmitted wirelessly from MIGSI to the receiving computer, where it can be used in any number of ways: as an improvisational counterpart, for real-time effects processing, for control over computer generated visuals, and so on.