The contract's default matrix (featureMatrixOf) with per-kind deviations
applied — the "counts + deviations" idiom for a desk that mostly matches the contract but
genuinely differs on a kind or two: a device with no SENS byte behind its preamp, a strip
that lacks channel EQ. Only the overridden kinds change; the rest keep the contract row.
The contract's default matrix (featureMatrixOf) with per-kind deviations applied — the "counts + deviations" idiom for a desk that mostly matches the contract but genuinely differs on a kind or two: a device with no SENS byte behind its preamp, a strip that lacks channel EQ. Only the overridden kinds change; the rest keep the contract row.