FA-11028 / Audio channel mixing / Member archive

Polarity invert selected channels · case 03

Inverting a selected channel applies polarity inversion to every channel.

Member previewVariant 3 · 3 implementations · 4 checks per implementation

Case contract

Invert the sign of samples only on selected channel indices, preserving frame layout and unselected channels; use floating or unbounded integer intermediates.

Why this case matters

A pure Python local audio pipeline stage with explicit sample formats and frame conventions; no real-time device or signal-spectrum claims.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
fixture 1	`[[-1, 2], [3, -4]]`	`[[-1, -2], [3, 4]]`	Failed

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This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

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