{"abstract":"Solo state is ignored when selecting audible tracks.","category":"Audio channel mixing","checks":4,"contract":"Mix equal-length tracks that are not muted and, when any solo set exists, are also soloed. Mute overrides solo.","evaluation_group":"xaud-channel-solo-versus-mute","failed_approach":"Requiring explicit solo when none is set silences normal playback and ignores mute overrides.","family":"xaud-channel-solo-versus-mute","id":"FA-10926","implementations":{"attempt":{"sha256":"cbf624fbc8bca9ae8226e5b1b3cb6b3afc9449ac5892d422ac9615290b1009cb","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport math\nN = 1\nobservations = []\ndef solve(tracks, solo, muted):\n    return [sum(track[i] for j,track in enumerate(tracks) if j in solo) for i in range(len(tracks[0]))] if tracks else []\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('fixture 1',solve(*([[1], [2], [4]], [1], [])),[2])\ncheck('fixture 2',solve(*([[1], [2]], [], [])),[3])\ncheck('fixture 3',solve(*([[1], [2]], [1], [1])),[0])\ncheck('fixture 4',solve(*([], [], [])),[])\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"broken":{"sha256":"45915cf5987655d644a9575bc36206b541299e69d5dc3672a91aacd6fe9faf05","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport math\nN = 1\nobservations = []\ndef solve(tracks, solo, muted):\n    return [sum(track[i] for j,track in enumerate(tracks) if j not in muted) for i in range(len(tracks[0]))] if tracks else []\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('fixture 1',solve(*([[1], [2], [4]], [1], [])),[2])\ncheck('fixture 2',solve(*([[1], [2]], [], [])),[3])\ncheck('fixture 3',solve(*([[1], [2]], [1], [1])),[0])\ncheck('fixture 4',solve(*([], [], [])),[])\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"fixed":{"sha256":"c0e65451744fa49ef8a20e39288ca8c925b160e6e4e1a0cabcd346e1f96c61d5","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport math\nN = 1\nobservations = []\ndef solve(tracks, solo, muted):\n    return [sum(track[i] for j,track in enumerate(tracks) if j not in muted and (not solo or j in solo)) for i in range(len(tracks[0]))] if tracks else []\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('fixture 1',solve(*([[1], [2], [4]], [1], [])),[2])\ncheck('fixture 2',solve(*([[1], [2]], [], [])),[3])\ncheck('fixture 3',solve(*([[1], [2]], [1], [1])),[0])\ncheck('fixture 4',solve(*([], [], [])),[])\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"}},"limitations":" This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.","method":"Deterministic executable model with adversarial boundary fixtures.","provenance":{"created_by":"Failure Map","dependencies":"Python standard library","family":"xaud-channel-solo-versus-mute","generated_at":"2026-09-29T14:38:43.469351+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"A pure Python local audio pipeline stage with explicit sample formats and frame conventions; no real-time device or signal-spectrum claims.","repair":"Apply the explicit PCM/playback contract: Mix equal-length tracks that are not muted and, when any solo set exists, are also soloed. Mute overrides solo.","root_cause":"Solo state is ignored when selecting audible tracks.","sha256":"95f65a88918c434251082e3a5a53e47d9ba07f51c78b646212d6c505fc27c67d","title":"Channel solo versus mute · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":36.715,"exit_code":1,"observations":[{"actual":[2],"check":"fixture 1","expected":[2],"passed":true},{"actual":[0],"check":"fixture 2","expected":[3],"passed":false},{"actual":[2],"check":"fixture 3","expected":[0],"passed":false},{"actual":[],"check":"fixture 4","expected":[],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 1\", \"actual\": [2], \"expected\": [2], \"passed\": true}, {\"check\": \"fixture 2\", \"actual\": [0], \"expected\": [3], \"passed\": false}, {\"check\": \"fixture 3\", \"actual\": [2], \"expected\": [0], \"passed\": false}, {\"check\": \"fixture 4\", \"actual\": [], \"expected\": [], \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":38.382,"exit_code":1,"observations":[{"actual":[7],"check":"fixture 1","expected":[2],"passed":false},{"actual":[3],"check":"fixture 2","expected":[3],"passed":true},{"actual":[1],"check":"fixture 3","expected":[0],"passed":false},{"actual":[],"check":"fixture 4","expected":[],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 1\", \"actual\": [7], \"expected\": [2], \"passed\": false}, {\"check\": \"fixture 2\", \"actual\": [3], \"expected\": [3], \"passed\": true}, {\"check\": \"fixture 3\", \"actual\": [1], \"expected\": [0], \"passed\": false}, {\"check\": \"fixture 4\", \"actual\": [], \"expected\": [], \"passed\": true}], \"passed\": false}\n"},"fixed":{"elapsed_ms":40.687,"exit_code":0,"observations":[{"actual":[2],"check":"fixture 1","expected":[2],"passed":true},{"actual":[3],"check":"fixture 2","expected":[3],"passed":true},{"actual":[0],"check":"fixture 3","expected":[0],"passed":true},{"actual":[],"check":"fixture 4","expected":[],"passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 1\", \"actual\": [2], \"expected\": [2], \"passed\": true}, {\"check\": \"fixture 2\", \"actual\": [3], \"expected\": [3], \"passed\": true}, {\"check\": \"fixture 3\", \"actual\": [0], \"expected\": [0], \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": [], \"expected\": [], \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}