https://ozinventions.com/xpression-fx/
Xpression Fx Motion, is a wireless motion controlled audio effects controller and MIDI controller. It changes effect parameters such as volume, pitch and filter by moving a small sensor attached to an instrument or body part. The system consists of two units, a wireless sensor-transmitter and a modulator-receiver. The transmitter module senses and sends motion data to the receiver. The receiver then modulates an effect or changes MIDI data relative to that information. In short, moving the sensor will change an effect parameter and/or change MIDI codes. Its like an expression pedal, but with more control over parameter modulation via software functions, and more control over expression via increased dexterity and motion dynamics. More info at the link above.