This demo is built entirely out of where a sound is. On speakers there
is no “where”, so it won't work — any headphones or earbuds will.
Listen.
LEFT
RIGHT
A tone will move to one ear, then the other.
Focus held
0%
A few honest minutes, held.
That was one 20-second round. The app runs a full session —
your own pitch-matched tone, rounds that adapt to you, and head-tracking
that keeps the sound still when you turn your head.