tilt moves the pen — vertical position picks a violin note (pentatonic, snapped).
sound input sets brush size and bow pressure (volume + brightness).
camera sets ink color and the violin's tone (warm hues = darker, cool = brighter).
connection speed tints the background and sets reverb size — slow & cavernous, fast & dry.
Touch the canvas to override the pen.
Needs https:// or localhost. Tap "Begin" and grant motion + microphone + camera. iOS asks once. Speed test pulls 512 KB from Cloudflare every 15 seconds.