{ "record_type": "netcomposer.performance_record", "record_format_version": null, "record_format_note": "Draft format (spec §5.7-5.9, §9.4 sketch), same shape as perf_ambient-cm-01 and the BWV 846 records.", "performance": { "id": "perf_ambient-cm-02", "title": "Cm into Am and F, with a slow C–F–G line (ambient): take 2, open-commons palette", "performed_at": "2026-10-18T15:09:09Z", "performed_at_local": "2026-10-18T08:09:09-07:00", "duration_s": 124.0, "music_ends_at_s": 120.0, "performer_mode": "algorithmic", "performer_id": null, "performer": { "name": "Astrid, NetComposer Algorithmic Performer (stand-in script on the box, not the netcomposer CLI)", "script": { "path": "nc_ambient_cm/render_ambient_cm_02.py", "sha256": "5c8c2041e0e7c334966da64f74c7234f4ed5a318b74c879b6240059964c9479d" } }, "rules_set_by": { "display_name": "Peter", "note": "Same Composition as take 1. Peter after take 1: \"Do it again and don't just use musicmatter sounds. Mix it up. Same vibe.\"" }, "composition_ref": { "composition_id": "nc_ambient_cm/composition_ambient_cm.md", "sha256": "70f714dcf1b6eef79451a1814095e4a8b05018417e5e1521971c6eadb2b49697", "composer": { "display_name": "Peter" }, "unchanged_since_perf01": true }, "rule_set": { "name": "ambient Cm (take 2, mixed palette)", "seed": 1018, "pulse_bpm": 60, "chord_length_s": 10.0, "section_A": "0-60 s. Six chords, type drawn at random from {Cm, Cm7, Cm9} (no immediate repeat, all three heard, last not Cm7, not perf01's sequence). Voicings drawn without reuse from a new pool built note by note from measured single notes (none of perf01's voicings).", "build": "38-62 s: pad/keys/drone +6 dB, low-pass opens (pad 1.2->3.2 kHz, keys 1.8->4.2 kHz), re-strikes 1 -> 2 (40 s) -> 4 (50 s), both Rhodes and piano strike, singing-bowl-like C5 bells at 45, 52.5, 58 s, waves swell +2.5 dB.", "section_B": "60-120 s: Cm7, Am, F, then Cm, Am, F. Iowa piano strikes (Rhodes added on alternate chords), cello under each chord, final F rings.", "line": "C5, F5, G5, one note about every 5 s (+-0.35 s seeded jitter) in 20 s cycles from 5 s. Timbre per cycle: piano, violin, piano+harp, violin, piano+violin, violin+harp. Quarter-note triplets (C-F-G in 2 beats) in the rest slot of cycles 2, 3, 4: 1:00 (guitar), 1:20 (piano), 1:40 (guitar).", "musicmatter_share": "4 faint strikes (2 sounds) in the first half; about 0.3% of pre-reverb energy", "energy_share_percent_pre_reverb": { "pad (Iowa piano stretched + Iowa cello)": 37.8, "keys (Rhodes + Iowa piano strikes)": 20.4, "line": 20.4, "bed (ocean waves)": 11.1, "drone (Iowa piano stretched)": 8.0, "bells": 2.0, "musicmatter chords": 0.3 }, "transforms_enabled": [ "trim", "gain", "fade", "filter", "reverb", "delay", "time_stretch" ], "pitch_shift": false, "pitch_policy": "Every pitched sound chosen by NC measurement (pYIN / FFT peak), not by label. Accepted within about +-15 cents; Iowa cello notes up to +15 c (G3)." }, "timeline": [ { "chord_index": 0, "start_s": 0.0, "end_s": 10.0, "section": "A", "chord": "Cm7", "voicing": [ "D#3", "G3", "A#3", "C4", "D#4" ], "keys": [ "rhodes" ], "restrikes_at_s": [], "cello": [ "C2", "A#3" ] }, { "chord_index": 1, "start_s": 10.0, "end_s": 20.0, "section": "A", "chord": "Cm9", "voicing": [ "C3", "G3", "A#3", "D4", "D#4" ], "keys": [ "rhodes" ], "restrikes_at_s": [], "cello": [ "C2", "A#3" ] }, { "chord_index": 2, "start_s": 20.0, "end_s": 30.0, "section": "A", "chord": "Cm", "voicing": [ "D#3", "C4", "G4" ], "keys": [ "rhodes" ], "restrikes_at_s": [], "cello": [ "C2", "G3" ] }, { "chord_index": 3, "start_s": 30.0, "end_s": 40.0, "section": "A", "chord": "Cm7", "voicing": [ "C3", "A#3", "D#4" ], "keys": [ "rhodes" ], "restrikes_at_s": [], "cello": [ "C2", "A#3" ] }, { "chord_index": 4, "start_s": 40.0, "end_s": 50.0, "section": "A (build)", "chord": "Cm9", "voicing": [ "D#3", "A#3", "D4", "G4" ], "keys": [ "rhodes", "piano" ], "restrikes_at_s": [ 45.3 ], "cello": [ "C2", "A#3" ] }, { "chord_index": 5, "start_s": 50.0, "end_s": 60.0, "section": "A (build)", "chord": "Cm", "voicing": [ "C3", "G3", "C4", "D#4" ], "keys": [ "rhodes", "piano" ], "restrikes_at_s": [ 52.8, 55.3, 57.8 ], "cello": [ "C2", "G3" ] }, { "chord_index": 6, "start_s": 60.0, "end_s": 70.0, "section": "B", "chord": "Cm7", "voicing": [ "C3", "G3", "A#3", "D#4" ], "keys": [ "piano" ], "restrikes_at_s": [ 65.3 ], "cello": [ "C2", "A#3" ] }, { "chord_index": 7, "start_s": 70.0, "end_s": 80.0, "section": "B", "chord": "Am", "voicing": [ "A2", "E3", "A3", "C4", "E4" ], "keys": [ "piano", "rhodes" ], "restrikes_at_s": [ 75.3 ], "cello": [ "E2" ] }, { "chord_index": 8, "start_s": 80.0, "end_s": 90.0, "section": "B", "chord": "F", "voicing": [ "F2", "F3", "A3", "C4" ], "keys": [ "piano" ], "restrikes_at_s": [ 85.3 ], "cello": [ "F3" ] }, { "chord_index": 9, "start_s": 90.0, "end_s": 100.0, "section": "B", "chord": "Cm", "voicing": [ "C3", "G3", "C4", "D#4" ], "keys": [ "piano", "rhodes" ], "restrikes_at_s": [ 95.3 ], "cello": [ "C2", "G3" ] }, { "chord_index": 10, "start_s": 100.0, "end_s": 110.0, "section": "B", "chord": "Am", "voicing": [ "E3", "A3", "C4", "E4" ], "keys": [ "piano" ], "restrikes_at_s": [ 105.3 ], "cello": [ "E2" ] }, { "chord_index": 11, "start_s": 110.0, "end_s": 120.0, "section": "B", "chord": "F", "voicing": [ "F3", "A3", "C4", "C5" ], "keys": [ "piano", "rhodes" ], "restrikes_at_s": [ 115.3 ], "cello": [ "F3" ] } ], "line_events": [ { "t": 5.093, "pitch": "C", "kind": "line", "timbre": "piano", "len": 7.0 }, { "t": 9.676, "pitch": "F", "kind": "line", "timbre": "piano", "len": 7.0 }, { "t": 15.107, "pitch": "G", "kind": "line", "timbre": "piano", "len": 7.0 }, { "t": 25.274, "pitch": "C", "kind": "line", "timbre": "violin", "len": 7.0 }, { "t": 29.706, "pitch": "F", "kind": "line", "timbre": "violin", "len": 7.0 }, { "t": 35.149, "pitch": "G", "kind": "line", "timbre": "violin", "len": 7.0 }, { "t": 44.776, "pitch": "C", "kind": "line", "timbre": "piano+harp", "len": 7.0 }, { "t": 50.038, "pitch": "F", "kind": "line", "timbre": "piano+harp", "len": 7.0 }, { "t": 54.982, "pitch": "G", "kind": "line", "timbre": "piano+harp", "len": 7.0 }, { "t": 60.015, "pitch": "C", "kind": "triplet", "timbre": "guitar", "len": 2.6 }, { "t": 60.681, "pitch": "F", "kind": "triplet", "timbre": "guitar", "len": 2.6 }, { "t": 61.348, "pitch": "G", "kind": "triplet", "timbre": "guitar", "len": 2.6 }, { "t": 64.85, "pitch": "C", "kind": "line", "timbre": "violin", "len": 7.0 }, { "t": 70.249, "pitch": "F", "kind": "line", "timbre": "violin", "len": 7.0 }, { "t": 74.787, "pitch": "G", "kind": "line", "timbre": "violin", "len": 7.0 }, { "t": 79.801, "pitch": "C", "kind": "triplet", "timbre": "piano", "len": 2.6 }, { "t": 80.468, "pitch": "F", "kind": "triplet", "timbre": "piano", "len": 2.6 }, { "t": 81.135, "pitch": "G", "kind": "triplet", "timbre": "piano", "len": 2.6 }, { "t": 84.796, "pitch": "C", "kind": "line", "timbre": "piano+violin", "len": 7.0 }, { "t": 90.323, "pitch": "F", "kind": "line", "timbre": "piano+violin", "len": 7.0 }, { "t": 95.346, "pitch": "G", "kind": "line", "timbre": "piano+violin", "len": 7.0 }, { "t": 100.069, "pitch": "C", "kind": "triplet", "timbre": "guitar", "len": 2.6 }, { "t": 100.736, "pitch": "F", "kind": "triplet", "timbre": "guitar", "len": 2.6 }, { "t": 101.403, "pitch": "G", "kind": "triplet", "timbre": "guitar", "len": 2.6 }, { "t": 105.106, "pitch": "C", "kind": "line", "timbre": "violin+harp", "len": 7.0 }, { "t": 109.861, "pitch": "F", "kind": "line", "timbre": "violin+harp", "len": 7.0 }, { "t": 114.69, "pitch": "G", "kind": "line", "timbre": "violin+harp", "len": 9.0 } ], "outputs": [ { "file": "nc_ambient_cm/nc_ambient_cm_perf02.flac", "format": "FLAC 24-bit/48 kHz stereo", "sha256": "9a3c04831beecf66ba0dd87ae03e57609f90fec379af9f1991bb6ebf22c9c370", "size_bytes": 15103122, "duration_s": 124.0, "loudness_lufs_integrated": -17.0, "true_peak_dbtp": -2.5, "lra_lu": 7.0 }, { "file": "nc_ambient_cm/nc_ambient_cm_perf02_preview.mp3", "format": "MP3 320 kbps, 48 kHz (preview)", "sha256": "83ae98b139df590c001405058b019965127fb39f9a954d2505562914f9b86105", "size_bytes": 4962284, "duration_s": 124.032, "loudness_lufs_integrated": -17.0, "true_peak_dbtp": -2.5, "lra_lu": 7.0 } ], "known_compromises": [ { "what": "Freesound sounds are HQ previews (lossy); originals need OAuth, not set up. Iowa MIS files are the lossless originals." }, { "what": "Iowa cello pp intonation varies by note; only notes measured within about +15 c were used (C2 +3, E2 +3, F3 +1, G3 +15, Bb3 +9). The G3 is audibly a touch sharp against the piano." }, { "what": "The pad and drone are x3.7 / x4 time-stretches of piano notes, so they carry phase-vocoder smear (bowed-piano texture), as in take 1." }, { "what": "Dropped after measurement: Jovica \"Chrunched Church Organ Drone Pad\" (off-key partials near F#2/G2 under C3), Jovica Melodrone \"Invisible Choir\" (did not measure as its labelled pitch), Jovica \"MegaDrone PadScape\" (every file sounds a semitone above its label, -15 to -30 c), bassimat Bowl Bell C3 (strong partial between F4 and F#4), Iowa vibraphone (motor tremolo defeated the pitch check), Iowa viola (run could not be segmented reliably). None of these are in the audio." }, { "what": "The violin F5 has a weak fundamental and strong 3rd partial (C7), so it reads brighter than its C5/G5; its gain is raised 3.5 dB and the line is low-passed at 5.5 kHz." }, { "what": "Iowa MIS terms are \"freely available ... used for any projects, without restrictions\", not a formal CC0/PD dedication; treated as public-domain equivalent, credited anyway." } ], "license_out": { "id": "CC-BY-SA-4.0", "uri": "https://creativecommons.org/licenses/by-sa/4.0/" } }, "hacks_chain": [ { "n": 1, "tool": "time_stretch", "engine": "ffmpeg rubberband", "options": "transients=smooth:window=long:phase=independent, pitch=1", "ratios": { "pad (piano)": 3.7333, "drone (piano)": 4.0, "cello": "about 2.1-2.4 (per note)" } }, { "n": 2, "tool": "gain", "type": "decay flatten (300 ms RMS follower, max +20 dB)", "applies_to": [ "pad", "drone" ] }, { "n": 3, "tool": "fade", "type": "equal-power swells and rolled strikes (0-90 ms seeded roll per chord)", "pad_in_s": 3.0, "pad_out_s": 4.5, "violin_in_s": 0.25 }, { "n": 4, "tool": "lowpass/highpass", "automation": "dark->bright crossfade 40-60 s, back toward dark over the last 15 s", "pad_hz": [ 1200, 3200 ], "keys_hz": [ 1800, 4200 ], "musicmatter_hz": [ 1500, 3000 ], "drone": "50 Hz HP, 280 Hz LP (4th order)", "bed": "120 Hz HP, 2.6 kHz LP", "bell": "750 Hz LP (8th order total)", "line": "180 Hz HP, 5.5 kHz LP" }, { "n": 5, "tool": "delay", "on": "line", "time_s": 0.75, "feedback": 0.3, "taps": 5, "ping_pong": true, "mix": 0.5 }, { "n": 6, "tool": "lufs_match", "targets_lufs": { "drone": -28.0, "pad": -22.0, "keys": -22.0, "line": -22.0, "bed": -29.0, "bell": -31.0, "mm": -31.0 }, "pan": { "drone": 0.0, "pad": -0.08, "keys": 0.1, "line": 0.15, "bed": 0.0, "bell": -0.2, "mm": -0.15 }, "build_gain_db": "pad/keys/drone -6 -> 0 over 38-62 s; bed 0 -> +2.5 (60 s) -> 0 (100 s) -> -3" }, { "n": 7, "tool": "reverb", "type": "synthetic hall, generated in the script", "rt60_s": 5.5, "predelay_ms": 40, "seed": 1018, "wet": 0.38 }, { "n": 8, "tool": "highpass", "cutoff_hz": 30 }, { "n": 9, "tool": "lowpass", "type": "gentle 9 kHz blend (40%)" }, { "n": 10, "tool": "tail", "rule": "music ends 120 s, 4 s fade, file 124 s" }, { "n": 11, "tool": "loudness", "method": "ffmpeg loudnorm two-pass, linear", "target_lufs": -17, "ceiling_dbtp": -1.5 } ], "sounds_used": [ { "key": "fs:65721", "source": "Freesound", "title": "C_S Rhodes Mark II D#2.aif", "source_url": "https://freesound.org/people/tim.kahn/sounds/65721/", "author": "tim.kahn", "audio_used": { "url": "https://cdn.freesound.org/previews/65/65721_7037-hq.ogg", "what": "Freesound HQ preview (lossy Ogg Vorbis), resampled to 48 kHz on decode, pitch unchanged", "sha256": "4628bc084794279c5c799c7ae89eafa80cdd04489645291febd9d26486f58cde", "size_bytes": 254124 }, "supplier": { "display_name": "tim.kahn", "primary_link": "https://freesound.org/people/tim.kahn/" }, "license": { "name": "CC BY 4.0", "uri": "https://creativecommons.org/licenses/by/4.0/", "verified_live": "2026-10-18, creativecommons.org/licenses/by/4.0" }, "credit_line": "“C_S Rhodes Mark II D#2.aif” by tim.kahn (https://freesound.org/people/tim.kahn/sounds/65721/), CC BY 4.0", "pitch_measured": { "sounding": "D#3", "cents": 4.7, "method": "NC pYIN on the preview" }, "roles": [ "rhodes strike" ], "uses": 4, "time_stretch_ratios": [ 1.0 ], "pitch_shift": false, "spans": [ { "key": "fs:65721", "layer": "keys", "at_s": 0.316, "len_s": 9.0, "gain_db": -1.67, "pitch_shift": false, "chord_index": 0, "midi": 51, "source_offset_s": 0.0, "time_stretch": 1.0, "role": "rhodes strike" }, { "key": "fs:65721", "layer": "keys", "at_s": 20.304, "len_s": 9.0, "gain_db": -2.53, "pitch_shift": false, "chord_index": 2, "midi": 51, "source_offset_s": 0.0, "time_stretch": 1.0, "role": "rhodes strike" }, { "key": "fs:65721", "layer": "keys", "at_s": 40.312, "len_s": 9.0, "gain_db": -1.71, "pitch_shift": false, "chord_index": 4, "midi": 51, 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] }, { "key": "fs:65714", "source": "Freesound", "title": "C_S Rhodes Mark II A#2.aif", "source_url": "https://freesound.org/people/tim.kahn/sounds/65714/", "author": "tim.kahn", "audio_used": { "url": "https://cdn.freesound.org/previews/65/65714_7037-hq.ogg", "what": "Freesound HQ preview (lossy Ogg Vorbis), resampled to 48 kHz on decode, pitch unchanged", "sha256": "3694992422be575c2ab55125ca7951a5a5d8e0663968190afe8baedec343ebbc", "size_bytes": 256401 }, "supplier": { "display_name": "tim.kahn", "primary_link": "https://freesound.org/people/tim.kahn/" }, "license": { "name": "CC BY 4.0", "uri": "https://creativecommons.org/licenses/by/4.0/", "verified_live": "2026-10-18, creativecommons.org/licenses/by/4.0" }, "credit_line": "“C_S Rhodes Mark II A#2.aif” by tim.kahn (https://freesound.org/people/tim.kahn/sounds/65714/), CC BY 4.0", "pitch_measured": { "sounding": "A#3", "cents": -3.3, "method": "NC pYIN on the preview" }, "roles": [ "rhodes strike" ], "uses": 5, 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