Theremin

How to play

• Touch mode — drag on the pad: X sets pitch (left = low, right = high), Y sets volume (bottom = silent, top = loud). A second finger adds vibrato (X = rate, Y = depth).
• Air mode — wave your hand in front of the front camera. Move left ↔ right to change pitch, and move toward or away from the camera to change volume (closer = louder, like leaning into a real theremin's volume antenna). The fingertip dot grows as you push your hand in, so you can see your dynamics. With two hands visible: your right hand drives pitch and volume, your left hand adds vibrato (X = rate, Y = depth).
• Pick a scale to snap pitches to a key — set it to Continuous for true theremin glide.
• Glide smooths big pitch jumps; turn it down for snappy attacks, up for liquid swoops.
• Paint turns your fingertip — finger on screen in touch mode, or right-hand index tip in air mode — into a glowing rainbow trail. Stays on for recordings, so a 10-second clip captures whatever you "drew" along with the audio.
• Rec 10s / 30s captures a sharable video of your performance. The Muted / Unmuted toggle next to the Rec buttons mixes your microphone into the recording when unmuted (your browser will ask for permission the first time). Mic is only on while a recording is actually in progress.