TILT ↔ VOLUME · TILT ↕ PITCH · TOUCH TO PLAY · LEAVE FRAME = SILENCE

▛ GYRO·THEREMIN ▜

Control the sound by tilting your phone: left-right sets volume, forward-back sets pitch. Hold the device steady and press START — it calibrates to your current grip. Keep the marker inside the frame; leaving it cuts the sound.

▶ START