{ "record_type": "netcomposer.performance_record", "record_format_version": null, "record_format_note": "No record format exists in the repo/CLI yet; this follows the field lists in spec §5.7, §5.8, §5.9 and §9.4 (spec marks them a draft/sketch). Same layout as the take 6 record.", "performance": { "id": "perf_bwv846-take5_fwd_rev_echo", "id_note": "Local id (folder + tag). NC has no Performance id registry yet.", "title": "The C major Prelude, harmony only (after Bach, BWV 846): take 5, forward/reverse echo", "performed_at": "2026-10-17T21:18:18Z", "performed_at_local": "2026-10-17T14:18:18-07:00", "performed_at_note": "From the mtime of the WAV master (America/Los_Angeles, UTC-7). Record built afterwards.", "duration_s": 126.384, "music_ends_at_s": 122.852, "performer_mode": "algorithmic", "performer_id": null, "performer_id_note": "NC has no system Identity for the engine yet.", "performer": { "name": "Astrid, NetComposer Algorithmic Performer (stand-in script on the box, not the netcomposer CLI)", "script": { "path": "bach/render5_fwd_rev_echo.py", "sha256": "66b4fabc2a2bf1523cbce9125f1d767f8d257ad9b935b111b6038ad245b72fbd" } }, "rules_set_by": { "id": null, "display_name": "Peter", "note": "Forward/reverse echo idea and LP sweep requested by Peter in chat; chord matching and take selection are the script's rules." }, "engine_version": "render5_fwd_rev_echo.py@sha256:66b4fabc2a2bf152", "composition_ref": { "composition_id": "compositions/bach_bwv846_prelude_progression.md", "version": null, "version_note": "Compositions are not versioned yet; the file hash pins the exact text.", "sha256": "f63acadc04937a289a2f51c96386a0ae92de8f7fba00c69a16a038632b9b43d5", "composer": { "id": null, "display_name": "Peter" }, "music": "Johann Sebastian Bach, Prelude in C major, BWV 846, Das Wohltemperierte Klavier I (1722). Public domain.", "analysis": { "credit": "Mark Gotham et al., When in Rome corpus", "file": "Corpus/Keyboard_Other/Bach,_Johann_Sebastian/The_Well-Tempered_Clavier_I/01/analysis.txt", "uri": "https://github.com/MarkGotham/When-in-Rome", "license": "CC-BY-SA-4.0", "local_copy": { "path": "bach/analysis.txt", "sha256": "4cec7458b5aec3e74218168f529589f3233e008d3b6dde3c3953eaca3dd23565" } } }, "rule_set": { "name": "bach-strikes fwd/rev echo (BWV 846 take 5)", "version": null, "seed": 846, "selection": { "pool": "type=chord strike (musicmatter.art v4 local copy, 702 strikes)", "match": "chord per bar from bars_v5.py (dim7 any enharmonic spelling)", "prefer": [ "lowest note = written bass (-20)", "small register jump (0.6x) and near MIDI 72 (0.4x)", "wide spreads penalised above 26 semitones (0.3x)" ], "no_match": "G7sus4 (bars 26, 30) built by layering Gsus4 + Csus4/G at -3 dB" }, "figuration": "two strikes per bar (beats 1 and 3; 2nd at -0.72 dB, bar 35 2nd at -5.19 dB). 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"source_url": "https://musicmatter.art/sounds/gsus4-bounce-3.flac", "manifest_url": "https://musicmatter.art/sounds/gsus4-bounce-3.nc.json", "supplier": { "id": null, "display_name": "Peter", "primary_link": "https://musicmatter.art/" }, "license": { "id": "CC-BY-SA-4.0", "uri": "https://creativecommons.org/licenses/by-sa/4.0/" }, "credit_line": "“G suspended 4th chord, bounce 3” by Peter (https://musicmatter.art/), CC BY-SA 4.0, https://musicmatter.art/sounds/gsus4-bounce-3.flac", "chord": "Gsus4", "register": { "low": "G4", "high": "D5", "root": "G4", "bass": "G4", "inversion": "root" }, "sha256": "0b1ef225911b744471f407ec423447aefa3040705d30024126eeef5cd01875b5", "sha256_note": "sha256 of the published FLAC (manifest field)", "content_hash_at_use": { "file": "site_v4/sounds/gsus4-bounce-3.wav", "sha256": "34c71b2fa446b1d116213a4dc67fb2de2efca6264031a7104abdad70a04d708e", "pcm_md5": "677347bc2b2331a802c29ffc3babd638", "pcm_identical_to_published_flac": true, "note": "Decoded PCM md5 equals the published FLAC's manifest pcm_md5: the audio used is sample-identical to what musicmatter.art serves." }, "uses": 4, "uses_as_layer": 0, "bars": [ 26, 30 ], "time_stretch_ratios": [ 1.0 ], "processing_plain": "strike sliced from the clip, played forward and reversed (echo swell), 40% hall (B voice 50%), swept 24 dB/oct low-pass", "spans": [ { "bar": 26, "beat": 1.0, "beats": 2, "chord_played": "Gsus4 + Csus4 (G7sus4)", "analysis": "C: V7 (G7(sus4))", "role": "primary", "source_offset_s": 0.0, "source_strike": 1, "placed_at_s": 86.957, "placed_at_timecode": "1:26.957", "voices": [ "A: forward strike", "B: reversed echo of the same strike, swelling into the next strike" ], "time_stretch_ratio": 1.0, "gain_db": 0.0, "transforms": [ { "type": "trim", "what": "one of the clip's two strikes (cut at 2.18 s, 20 ms overlap, 30 ms fade-out)" }, { "type": "level_match", "target": "unit RMS over first 1 s" }, { "type": "reverse", "voice": "B" } ], "match_score": null, "match_score_note": "The script ranks takes by a cost (lower is better), not a confidence; no score was stored." }, { "bar": 26, "beat": 3.0, "beats": 2, "chord_played": "Gsus4 + Csus4 (G7sus4)", "analysis": "C: V7 (G7(sus4))", "role": "primary", "source_offset_s": 2.16, "source_strike": 2, "placed_at_s": 88.696, "placed_at_timecode": "1:28.696", "voices": [ "A: forward strike", "B: reversed echo of the same strike, swelling into the next strike" ], "time_stretch_ratio": 1.0, "gain_db": -0.72, "transforms": [ { "type": "trim", "what": "one of the clip's two strikes (cut at 2.18 s, 20 ms overlap, 30 ms fade-out)" }, { "type": "level_match", "target": "unit RMS over first 1 s" }, { "type": "reverse", "voice": "B" }, { "type": "gain", "db": -0.72 } ], "match_score": null, "match_score_note": "The script ranks takes by a cost (lower is better), not a confidence; no score was stored." }, { "bar": 30, "beat": 1.0, "beats": 2, "chord_played": "Gsus4 + Csus4 (G7sus4)", "analysis": "C: V7 (alt ii754) (G7(sus4))", "role": "primary", "source_offset_s": 0.0, "source_strike": 1, "placed_at_s": 100.87, "placed_at_timecode": "1:40.870", "voices": [ "A: forward strike", "B: reversed echo of the same strike, swelling into the next strike" ], "time_stretch_ratio": 1.0, "gain_db": 0.0, "transforms": [ { "type": "trim", "what": "one of the clip's two strikes (cut at 2.18 s, 20 ms overlap, 30 ms fade-out)" }, { "type": "level_match", "target": "unit RMS over first 1 s" }, { "type": "reverse", "voice": "B" } ], "match_score": null, "match_score_note": "The script ranks takes by a cost (lower is better), not a confidence; no score was stored." }, { "bar": 30, "beat": 3.0, "beats": 2, "chord_played": "Gsus4 + Csus4 (G7sus4)", "analysis": "C: V7 (alt ii754) (G7(sus4))", "role": "primary", "source_offset_s": 2.16, "source_strike": 2, "placed_at_s": 102.609, "placed_at_timecode": "1:42.609", "voices": [ "A: forward strike", "B: reversed echo of the same strike, swelling into the next strike" ], "time_stretch_ratio": 1.0, "gain_db": -0.72, "transforms": [ { "type": "trim", "what": "one of the clip's two strikes (cut at 2.18 s, 20 ms overlap, 30 ms fade-out)" }, { "type": "level_match", "target": "unit RMS over first 1 s" }, { "type": "reverse", "voice": "B" }, { "type": "gain", "db": -0.72 } ], "match_score": null, "match_score_note": "The script ranks takes by a cost (lower is better), not a confidence; no score was stored." } ] } ], "summary": { "distinct_sounds": 28, "total_uses": 74, "suppliers": [ "Peter" ] }, "derived_inputs": { "inputs": [ { "what": "Bach, BWV 846 (the music)", "license": "Public domain" }, { "what": "When in Rome analysis (Gotham et al.), BWV 846", "license": "CC-BY-SA-4.0", "attribution": "required, given in the credits" }, { "what": "28 chord strike offerings by Peter (musicmatter.art)", "license": "CC-BY-SA-4.0", "attribution": "required, given per sound" }, { "what": "Synthetic hall IR", "license": "generated in the script; no third-party input" } ], "accepted_input_licenses": [ "CC0-1.0", "CC-BY-4.0", "CC-BY-SA-4.0", "Public domain" ], "rejected_present": [], "check": "OK: every input is public domain or CC BY-SA 4.0, none NC/ND, so the output can be CC BY-SA 4.0." }, "attribution": "“The C major Prelude, harmony only (after Bach, BWV 846)”, NetComposer Performance perf_bwv846-take5_fwd_rev_echo, composed by Peter after J.S. Bach (public domain), with harmonic analysis from When in Rome by Mark Gotham et al. (CC BY-SA 4.0, github.com/MarkGotham/When-in-Rome). Performed by the NetComposer Algorithmic Performer (Astrid) from 28 chord recordings by Peter (musicmatter.art, CC BY-SA 4.0). Licensed CC BY-SA 4.0, https://creativecommons.org/licenses/by-sa/4.0/", "provenance_files": { "render_script": { "path": "bach/render5_fwd_rev_echo.py", "sha256": "66b4fabc2a2bf1523cbce9125f1d767f8d257ad9b935b111b6038ad245b72fbd" }, "bar_table": { "path": "bach/bars_v5.py", "sha256": "e3f95ff9c2e235b242b4672cd6aab0dca7f5867bd428fcfc0a4a0274ef3c79b7" }, "analysis_file": { "path": "bach/analysis.txt", "sha256": "4cec7458b5aec3e74218168f529589f3233e008d3b6dde3c3953eaca3dd23565" }, "plan": { "path": "perf_bwv846/plan_take5_fwd_rev_echo.txt", "sha256": "38969c30338c97f05583933bf3e8086604813d00a8a9729a06857fb3cd0e2f8e" }, "record_builder": { "path": "tools/build_record_846_take5.py", "sha256": "038a4665a9fe07fd1984129952a1bd72ceca52e8beebd755d9600fc8f870c954" } }, "provenance_note": "The render script and bar table carry the same mtime as the master (14:18), so the hashed files are the versions that rendered it.", "created_at": "2026-10-17T18:27:28-07:00", "signature": { "status": "UNSIGNED", "signed_by": null, "algorithm": null, "key_id": null, "value": null, "note": "Placeholder. Open decision #33 (signed usage records) is not decided: no key, signer or format exists. record_hash gives integrity, not authorship." }, "record_hash": { "algorithm": "sha256", "over": "canonical JSON (sorted keys, no whitespace) of the record without record_hash and signature", "value": "bdac1317881a82dd1467240291eb0e5a7ab0a11c4f418b6ef2c53384082c36ca" }, "amendments": [ { "at": "2026-10-17T19:29:52-07:00", "what": "Contributor display name changed from 'Petrus' to 'Peter' (Peter Semmelhack) for netcomposer.art, at his request. No audio, input, setting or other field changed.", "previous_record_hash": "d17c38ba79ba9451cb58ef993201693289aaf2122ec80933764d345826e11340", "original_record": "unchanged in the NetComposer working files" } ] }