@fool @jelwell Great question!
The w32 Control Hub (specific to the Droid Inventor Kit) is designed to listen to BLE controls in the Droid Inventor App. There is not an open programming library available for non-app controls.
When controlling bits through the Control Hub, keep in mind that it outputs a default signal of 2.5 - 2.7 V - as oppose to a BLE bit which remains at 0.0V output until instructed otherwise. This is because most Droid app missions start with a a neutral signal for a motor (ie. telling a DC Motor in VAR mode to stop or telling a Servo to stay halfway turned so the Droid rolls straight)
If you are going to remix with the Droid Control Hub, be sure to get acquainted with the in app missions first, as a lot of them have different controls. You can also see unlocked controller options in the Droid Controls section. I recommend trying the "Triple Slider" and "Custom Droid" controllers.
Finally, please note that the w33 Control Hub from the Space Rover Inventor Kit is specifically controlled via the new littleBits app and is not interchangeable with a w32 Droid Control Hub.
Hope this helps!