Holon.ist, from Holonic Systems Oy, was updated with support for the accelerometers in AirPod Pro's. The Augmented Reality app can now use the orientation of your head to generate MIDI or OSC messages.
You can test this out in the demo version, Holon. The AirPod Pro MIDI can be used without any IAP, and the free demo includes presets to connect to fun places like miRack on iOS or their own Reaktor creations.
They're also celebrating this update with a sale!
What's new in Holon.ist v1.0.2:-Apple AirPods Pro support! Use AirPods Pro's as head mounted MIDI controllers or send OSC for networked performances.
-Improved Locations feature: "Aim" signal now works for custom locations. Turn landmarks into musical parameters!
-Improved Sun/Moon and Wind feature: "Aim" using device heading is implemented. Drive into the sunset! Run like the wind!
-Other minor fixes.