two-device theremin · phone emits ultrasonic field · laptop mic listens · right hand disrupts the field → pitch · phone gyro → volume + vibrato · p2p · runs locally
phone in your left hand. right hand in the space between. the field is real. the sound is yours.
the phone speaker emits two ultrasonic tones (18.5 + 19.5 khz) — above human hearing, physically real, carried through air to the laptop microphone. your right hand disrupts that field. your left hand holds the phone — its tilt and motion are streamed via webrtc and control volume and vibrato.
click host session — a link appears instantly. send it to your phone.
1. laptop hosts. phone joins via the link.
2. phone flat on table at full speaker volume · emits 18.5 + 19.5 khz.
3. calibration sweep — move phone slowly closer and further while laptop maps signal range.
4. pick up phone in left hand. right hand in the gap between. play.