Audio Spectrogram Transformer, ~86M parameters, 2,196 output columns. This is the first candidate in the Nocturne line to clear our pre-committed release gate against the v1 teacher. It got there by fixing two supervision bugs, not by adding data — which is the most useful thing in this card. Read the limitations section before deploying it. On an unseen recording site this model is substantially worse than v1, and our much smaller distilled student beats it outright on the very test it was released for. Both are stated with numbers below. Identical 13,710-clip held-out test set, per-class thresholds calibrated on validation, scored over the 2,182 name-aligned core classes. Rows are…


