Eight rows, one for each q.d colour, tuned to a pentatonic ladder. Tap steps to write a pattern. evolve lets the pattern grow by its own rule: each column copies a neighbour's note, mutates, or rests, so it drifts like a population. LIT 12-tone equal temperament, f = 440·2^((n−69)/12); the self-check verifies every row's frequency against this formula. ANALOGY q.d states as notes. ← SaPpH{{i}}on
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