How keystrum turns a QWERTY keyboard into a 6-chord strum machine

The QWERTY keyboard already has the right shape: rows of keys, columns of keys. What if each column became a chord, and each row became a strum lane? That's keystrum — a browser-based instrument that maps your keyboard to six chords. No external instrument, no samples, no install. Pure Web Audio. The layout Am C Em G Dm F ┌──────┬──────┬──────┬──────┬──────┬──────┐ E4 │ 1 │ 2 │ 3 │ 4 │ 5 │ 6 │ ← highest pitch ├──────┼──────┼──────┼──────┼──────┼──────┤ B3 │ Q │ W │ E │ R │ T │ Y │ ├──────┼──────