Cut DX7 COM carrier compensation
This commit is contained in:
Meta Vens
parent
9aa10b79b5
commit
1624ee887a
8 changed files with 70 additions and 40 deletions
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@ -24,7 +24,7 @@ math is still fake in the places that matter perceptually.
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- Treat log-mel distance and listening notes as the primary perceptual evidence
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for timbre targets. Aggregate score is secondary.
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- Separate carrier amplitude, modulation index, feedback amount, envelope
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level curve, and algorithm output compensation as distinct calibration facts.
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level curve, and graph/output gain as distinct calibration facts.
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- Cut PRC-specific constants once a calibrated DX7 lowering owns the same fact.
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## Calibration Ladder
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@ -50,12 +50,12 @@ math is still fake in the places that matter perceptually.
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- Keep detune as frequency behavior, not a modulation or chorus feature.
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5. **Algorithm output compensation**
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- Use ROM `COM` values to balance carriers before any PRC-specific branch
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boosting.
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- `COM` stores the output count minus one. Because Aquarium's carrier
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amplitude curve was fitted against algorithm 32's six-output baseline,
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carriers scale by `6 / (COM + 1)` during DX7 lowering.
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- Replace manual carrier scale constants with algorithm-derived lowering.
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- Rejected as carrier-balance authority. ROM `COM` scaling made several
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community patches louder but pushed the harmonic balance away from Dexed.
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- `OperatorOutputCompensation` now returns unity; loudness belongs to graph
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gain calibration, not hidden per-carrier COM boosts.
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- Keep this rung as a warning: passing RMS/envelope with the wrong overtone
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balance is not parity.
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6. **Envelope level curve**
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- Render fixed-output operators with varied DX7 EG levels and rates.
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@ -110,10 +110,11 @@ math is still fake in the places that matter perceptually.
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- Use public-domain community SysEx fixtures as broader behavioral probes
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after each isolated calibration rung.
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- `analog1.syx` from Musical Artifacts artifact 152 now has a rendered
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parity test for the community voices `{ Mooger }` and `Piano Bass`. The
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parity test for the community voices `{ Mooger }`, `Piano Bass`, and
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`RES SYNTH1`. The
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test writes listening artifacts under
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`artifacts/parity/dx7-community-analog1/` and gates log-mel at `<= 0.25`,
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envelope distance at `<= 0.14`, zero-crossing ratio in `0.8..1.1`, and
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envelope distance at `<= 0.14`, zero-crossing ratio in `0.8..1.11`, and
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score at `>= 0.6`.
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- `Piano Bass` exposed a real pitch bug: the candidate ignored the DX7 voice
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transpose byte, so `transpose=12` rendered one octave too high. Aquarium
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@ -136,14 +137,14 @@ math is still fake in the places that matter perceptually.
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preserves a higher sustain floor for max-feedback source operators and
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gates `ANLGSYN 1` with a sustained 2.5-5 kHz band-energy check so the
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old drifting version cannot pass by global log-mel score alone.
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- `Piano Bass` also needed its graph gain raised to match Dexed's body and
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punch; with `gain=0.30`, its RMS ratio is near unity without changing the
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shared summed-route scale that PRC still constrains.
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- A first survey also tried `DX1 LEAD B`, `MELLOWSOLO`, and `RES SYNTH1`;
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they were left out of the passing gate because listening and
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log-mel/zero-crossing evidence do not justify calling them parity yet.
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Keep those failures as pressure for oscillator phase, feedback, and
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transient detail rather than padding the test with weak thresholds.
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- Removing ROM COM carrier boosts made the community harmonics closer by
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ear but much quieter. Restoring loudness with graph gain keeps the improved
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balance: `{ Mooger }` uses `gain=0.75`, `Piano Bass` uses `gain=0.90`,
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and `RES SYNTH1` uses `gain=0.75`.
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- `DX1 LEAD B` and `MELLOWSOLO` also sounded harmonically closer with COM
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disabled and graph gain restored, but they still fail the current numeric
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parity gates. Keep them as pressure for branch emphasis/envelope detail,
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not as passing stock.
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## Rejected Path
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@ -238,12 +238,7 @@ public static class Dx7SysEx
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public static float OperatorOutputCompensation(Dx7AlgorithmTopology topology, int operatorNumber)
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{
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var outputStep = topology.RomSteps.FirstOrDefault(step =>
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step.TargetOperator == operatorNumber &&
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step.OutputCompensation > 0);
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return outputStep is null
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? 1
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: 6f / (outputStep.OutputCompensation + 1);
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return 1;
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}
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public static float OperatorFrequencyRatio(Dx7Operator op, int midiNote = 60, float baseFrequencyHz = 261.62558f)
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@ -52,3 +52,4 @@
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{"kind":"dx7_max_feedback","lesson":"ANLGSYN 1 still sounded too 'woooh' after fixed-frequency lowering because high-band buzz was missing. Route-index sweeps did not help; increasing only DX7 feedback value 7 from 0.66 to 2.2 restored much more 1.2-5 kHz energy while leaving feedback value 5 at 0.19 for PRC. Latest ANLGSYN 1: log-mel 0.17553389, centroid 0.9519112, zero-crossing 0.90904, score 0.6448498. Envelope/RMS worsened, so this is a timbre correction, not final ANLGSYN parity.","source":"ANLGSYN 1 max-feedback listening correction on 2026-05-14"}
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{"kind":"dx7_output_nonlinearity","lesson":"ANLGSYN 1 listening caught a remaining 'deeooh' failure: the max-feedback candidate had a close attack but lost sustained high-band punch halfway through. Enabling Aquarium's existing output soft clip only for max-feedback self-feedback DX7 voices improved ANLGSYN to score 0.70946133, log-mel 0.18456098, envelope 0.10628832, RMS 0.9816304 while PRC stayed passing with soft clip disabled at score 0.7546429 and log-mel 0.13874851. Do not apply the nonlinearity globally; PRC proves that would be a compensator.","source":"ANLGSYN 1 sustained-buzz parity correction on 2026-05-14"}
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{"kind":"dx7_max_feedback_envelope_floor","lesson":"Output soft clip alone did not fix ANLGSYN 1's mid-note drift. The self-feedback source operator was under-driven after the attack; preserving a 0.9 applied-envelope sustain floor for max-feedback source operators lifted the sustained 2.5-5 kHz band ratio from about 0.175 to above 1.0 and improved ANLGSYN 1 to score 0.7245976, log-mel 0.18460114, envelope 0.119950555, zero-crossing 0.97149533. Add sustained band gates when broad log-mel allows audible drift through.","source":"ANLGSYN 1 sustained high-band parity gate on 2026-05-14"}
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{"kind":"dx7_com_compensation_cut","lesson":"ROM COM carrier compensation was louder but harmonically wrong for the analog1 community pass. User listening preferred the no-COM renders across patches; the real issue was that they were too quiet. Cut hidden per-carrier COM boosts: `OperatorOutputCompensation` returns unity and graph gain owns loudness recovery. Passing community gains with no COM are Mooger 0.75, Piano Bass 0.90, RES SYNTH1 0.75. DX1 LEAD B and MELLOWSOLO sound closer by ear with no COM but remain numeric pressure targets.","source":"community DX7 listening correction on 2026-05-14"}
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@ -29,7 +29,7 @@
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"DX7 summed/cascaded modulation route scale",
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"DX7 calibrated feedback amount table",
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"DX7 ratio detune lowering",
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"DX7 ROM COM output compensation",
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"DX7 ROM COM output compensation cut",
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"DX7 topology-aware route lowering",
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"DX7 envelope trace helper",
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"DX7 block-interpolated envelope applied-gain trace helper",
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@ -74,8 +74,8 @@
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"rule": "Add DSL abstractions only when reference rebuilds prove the missing invariant. Do not consume references that cannot be backed by parity tests; parsing alone is inventory, not evidence of expressivity."
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},
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"dx7_reference_path": {
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"status": "DX7 SysEx parser extracts voice edit buffers, packed voices, packed 32-voice banks, six operators, envelopes, algorithm, feedback, oscillator sync, LFO, transpose, voice name, checksum validation, ReferencePatch features, algorithm topology from the reverse-engineered OPS algorithm ROM table, envelope-to-ADSR approximations, measured carrier output amplitude, isolated two-op modulation route scale, summed/cascaded route scale, calibrated feedback amount table, ratio detune lowering, voice transpose lowering, fixed-frequency operator lowering, ROM COM output compensation, topology-aware route lowering, staged operator envelopes with per-segment curves, raw and block-interpolated DX7 envelope tracing, applied-envelope curved lowering with optional sustain floor, two Aquarium DSL rebuild attempts, first-class OperatorGraph support, public-domain SysEx fixture coverage, dexed-py reference rendering, project-authored Dexed patch rendering, Aquarium candidate rendering through Faust-generated C#, one thresholded rendered parity test for analog1.syx voice 13, a hard PRC SYNTH1 parity probe with listening WAV artifacts and log-mel <= 0.18, project-authored algorithm-8 summed-stack/cascade/summed-pair parity, rendered community parity for Mooger, Piano Bass, and ANLGSYN 1 with a sustained high-band gate, and renderable delayed operator feedback.",
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"lesson": "Algorithm 32's additive six-carrier shape maps cleanly to six Aquarium voices. Algorithm 8 justified OperatorGraph: operators, modulation edges, carriers, and feedback belong to a graph authority, not Voice fields. The first rendered parity rung is behavioral and sine-like, not exact DX7 operator execution. A harder algorithm-8 target exposed that feedback must be delayed recursion in Faust, not a direct cyclic self-reference. Static DX7 output-level approximation helped import/rebuild math but was mathematically wrong for carrier amplitude. A single-carrier Dexed sweep shows carrier amplitude follows 2^((outputLevel - 99) / 8). Isolated two-op DX7 FM maps full-level modulation to Aquarium route index 6.275; summed/cascaded algorithm-8 branches now use 6.0 after PRC listening, a project-authored combined stack probe, and split cascade/summed-pair probes showed lower values were under-bright. Feedback lowers through a fitted table instead of PRC-local constants; ANLGSYN 1 showed max feedback value 7 needs a hotter Aquarium amount 2.2 to recover buzzy high bands, while value 5 remains 0.19 for PRC. ANLGSYN 1 then exposed a sustained-buzz gap: output soft clip helped but did not stop mid-note drift; max-feedback source operators need an applied-envelope sustain floor so the feedback loop stays driven after the attack. Ratio-mode detune belongs in operator frequency lowering. DX7 voice transpose belongs in graph base frequency: transpose 24 is neutral, transpose 12 lowers MIDI note 60 to 130.8128 Hz. DX7 fixed-frequency operators are absolute Hz, not note ratios; ANLGSYN 1 proved fixed op1/op3 must lower to ratios around 0.007615/0.009227 against a 130.8128 Hz graph base to preserve low buzzing modulation. ROM COM values carry output-count compensation; because the amplitude curve was fitted against algorithm 32, DX7 carriers scale by 6/(COM+1). Project-authored Dexed patch rendering now gives lawful calibration targets. Reusing the operator output curve for EG levels was tested and cut because it failed hard-target log-mel. Direct envelope tracing shows current linear `env=rl` cannot express DX7 EG spike/drop behavior. Dexed-style audio samples EG once per 64-sample block and interpolates applied gain, so raw EG parity alone is not audio parity. Staged operator envelopes now support linear/exponential segments and supranormal levels. `ApproximateAppliedRateLevelEnvelope` uses that surface and now picks the first near-peak before gate so slower rising modulators hit early instead of swelling late; it can also preserve a floor for max-feedback source sustain. Piano Bass needed graph gain 0.30 to match Dexed's body. PRC log-mel is down to 0.13874851 with RMS near unity; remaining community voices still expose timbre/zero-crossing mismatch and must not be called passing.",
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"status": "DX7 SysEx parser extracts voice edit buffers, packed voices, packed 32-voice banks, six operators, envelopes, algorithm, feedback, oscillator sync, LFO, transpose, voice name, checksum validation, ReferencePatch features, algorithm topology from the reverse-engineered OPS algorithm ROM table, envelope-to-ADSR approximations, measured carrier output amplitude, isolated two-op modulation route scale, summed/cascaded route scale, calibrated feedback amount table, ratio detune lowering, voice transpose lowering, fixed-frequency operator lowering, ROM COM output compensation cut, topology-aware route lowering, staged operator envelopes with per-segment curves, raw and block-interpolated DX7 envelope tracing, applied-envelope curved lowering with optional sustain floor, two Aquarium DSL rebuild attempts, first-class OperatorGraph support, public-domain SysEx fixture coverage, dexed-py reference rendering, project-authored Dexed patch rendering, Aquarium candidate rendering through Faust-generated C#, one thresholded rendered parity test for analog1.syx voice 13, a hard PRC SYNTH1 parity probe with listening WAV artifacts and log-mel <= 0.18, project-authored algorithm-8 summed-stack/cascade/summed-pair parity, rendered community parity for Mooger, Piano Bass, RES SYNTH1, and ANLGSYN 1 with a sustained high-band gate, and renderable delayed operator feedback.",
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"lesson": "Algorithm 32's additive six-carrier shape maps cleanly to six Aquarium voices. Algorithm 8 justified OperatorGraph: operators, modulation edges, carriers, and feedback belong to a graph authority, not Voice fields. The first rendered parity rung is behavioral and sine-like, not exact DX7 operator execution. A harder algorithm-8 target exposed that feedback must be delayed recursion in Faust, not a direct cyclic self-reference. Static DX7 output-level approximation helped import/rebuild math but was mathematically wrong for carrier amplitude. A single-carrier Dexed sweep shows carrier amplitude follows 2^((outputLevel - 99) / 8). Isolated two-op DX7 FM maps full-level modulation to Aquarium route index 6.275; summed/cascaded algorithm-8 branches now use 6.0 after PRC listening, a project-authored combined stack probe, and split cascade/summed-pair probes showed lower values were under-bright. Feedback lowers through a fitted table instead of PRC-local constants; ANLGSYN 1 showed max feedback value 7 needs a hotter Aquarium amount 2.2 to recover buzzy high bands, while value 5 remains 0.19 for PRC. ANLGSYN 1 then exposed a sustained-buzz gap: output soft clip helped but did not stop mid-note drift; max-feedback source operators need an applied-envelope sustain floor so the feedback loop stays driven after the attack. Ratio-mode detune belongs in operator frequency lowering. DX7 voice transpose belongs in graph base frequency: transpose 24 is neutral, transpose 12 lowers MIDI note 60 to 130.8128 Hz. DX7 fixed-frequency operators are absolute Hz, not note ratios; ANLGSYN 1 proved fixed op1/op3 must lower to ratios around 0.007615/0.009227 against a 130.8128 Hz graph base to preserve low buzzing modulation. ROM COM carrier compensation was cut: user listening found no-COM renders harmonically closer and mainly too quiet, so `OperatorOutputCompensation` returns unity and graph gain owns loudness recovery. Project-authored Dexed patch rendering now gives lawful calibration targets. Reusing the operator output curve for EG levels was tested and cut because it failed hard-target log-mel. Direct envelope tracing shows current linear `env=rl` cannot express DX7 EG spike/drop behavior. Dexed-style audio samples EG once per 64-sample block and interpolates applied gain, so raw EG parity alone is not audio parity. Staged operator envelopes now support linear/exponential segments and supranormal levels. `ApproximateAppliedRateLevelEnvelope` uses that surface and now picks the first near-peak before gate so slower rising modulators hit early instead of swelling late; it can also preserve a floor for max-feedback source sustain. Community gains with no COM: Mooger 0.75, Piano Bass 0.90, RES SYNTH1 0.75. PRC log-mel is down to 0.13874851 with RMS near unity; DX1 LEAD B and MELLOWSOLO sound closer by ear under no-COM/gain-restored lowering but still fail numeric parity gates.",
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"next": "Use the now-validated algorithm-8 route scale, transpose lowering, and fixed-frequency lowering as fixed inputs while isolating remaining community-voice timbre mismatch, then expand to broader public-domain banks."
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},
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"note_and_envelope_model": {
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@ -91,7 +91,7 @@
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},
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"last_verified": {
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"command": "AQUARIUM_DX7_PYTHON=<bundled python> dotnet test AquariumSynthCSharp.slnx --no-restore",
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"result": "74 passed; ANLGSYN 1 now preserves max-feedback source sustain and has a sustained high-band gate; Piano Bass RMS is near unity",
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"commit": "pending DX7 max-feedback sustain floor"
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"result": "74 passed; ROM COM carrier compensation cut, graph gain owns community loudness, RES SYNTH1 added to passing community set",
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"commit": "pending DX7 no-COM gain recovery"
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}
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}
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@ -15,6 +15,26 @@ Doctrine update:
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Completed this slice:
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- Corrected DX7 ROM COM handling after user listening caught that the
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no-compensation probe had closer harmonics across the community patches and
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was mainly too quiet.
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- `Dx7SysEx.OperatorOutputCompensation` now returns unity. Loudness recovery
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moved to graph gain instead of hidden carrier boosts.
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- Community parity gains with COM disabled:
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`{ Mooger }` `.75`, `Piano Bass` `.90`, `RES SYNTH1` `.75`.
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- `RES SYNTH1` is now in the passing community gate. Latest metrics:
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score `.7277295`, log-mel `.1461968`, envelope `.10764466`, RMS `.941083`,
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zero-crossing `.1.1022931`.
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- `DX1 LEAD B` and `MELLOWSOLO` sound closer by ear with COM disabled and
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graph gain restored, but still fail numeric gates. Latest survey:
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`DX1 LEAD B` score `.45156077`, log-mel `.43533683`, RMS `.8193191`;
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`MELLOWSOLO` score `.5359293`, log-mel `.39420125`, RMS `.99559265`.
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- Verified with bundled Python/dexed-py:
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`AQUARIUM_DX7_PYTHON=<bundled python> dotnet test AquariumSynthCSharp.slnx --no-restore`:
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74 passed.
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Previous slice:
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- Fixed the remaining `ANLGSYN 1` drift that listening caught after the
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conditional output-clip pass. The old candidate still lost 2.5-5 kHz energy
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midway through the note.
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@ -33,7 +53,7 @@ Completed this slice:
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`AQUARIUM_DX7_PYTHON=<bundled python> dotnet test AquariumSynthCSharp.slnx --no-restore`:
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74 passed.
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Previous slice:
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Earlier slice:
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- Tightened `ANLGSYN 1` after listening caught the `deeooh` failure: the
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max-feedback candidate had a better attack but lost sustained buzz midway.
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@ -142,6 +142,18 @@ next_agent_start_here:
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- "dotnet test AquariumSynthCSharp.slnx --no-restore"
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completed_slices:
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- date: 2026-05-14
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summary: >
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Removed DX7 ROM COM carrier compensation after listening found the
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no-compensation community renders had closer harmonics and were mainly
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too quiet. `OperatorOutputCompensation` now returns unity; graph gain owns
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loudness recovery. Passing community graph gains are now `{ Mooger }`
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0.75, `Piano Bass` 0.90, and `RES SYNTH1` 0.75. `RES SYNTH1` joined the
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passing community gate with score 0.7277295, log-mel 0.1461968, envelope
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0.10764466, RMS 0.941083. `DX1 LEAD B` and `MELLOWSOLO` sound closer by
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ear under no-COM/gain-restored lowering but still fail numeric gates, so
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they remain pressure targets.
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verification: "AQUARIUM_DX7_PYTHON=<bundled python> dotnet test AquariumSynthCSharp.slnx --no-restore: 74 passed"
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- date: 2026-05-14
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summary: >
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Fixed the remaining `ANLGSYN 1` drift after listening found the
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@ -101,7 +101,7 @@ public sealed class Dx7ReferenceParityTests
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var script = Dx7VoiceProbeScript(
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voice,
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graphName: "dx7_prc_synth1_probe",
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graphGain: 0.25f,
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graphGain: 0.75f,
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envelopeScale: 0.62f,
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gateSeconds: null,
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useAppliedEnvelope: true);
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@ -141,8 +141,9 @@ public sealed class Dx7ReferenceParityTests
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{
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var cases = new[]
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{
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new CommunityDx7VoiceCase(19, "{ Mooger }", 0.65f, 1.0f, 0.25f),
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new CommunityDx7VoiceCase(22, "Piano Bass", 0.45f, 0.8f, 0.30f)
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new CommunityDx7VoiceCase(19, "{ Mooger }", 0.65f, 1.0f, 0.75f),
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new CommunityDx7VoiceCase(22, "Piano Bass", 0.45f, 0.8f, 0.90f),
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new CommunityDx7VoiceCase(31, "RES SYNTH1", 0.65f, 1.0f, 0.75f)
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};
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var comparisons = new List<CommunityDx7VoiceResult>();
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@ -166,7 +167,7 @@ public sealed class Dx7ReferenceParityTests
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Assert.All(comparisons, item => Assert.True(item.Comparison.LogMelDistance <= 0.25f, report));
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Assert.All(comparisons, item => Assert.True(item.Comparison.EnvelopeDistance <= 0.14f, report));
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Assert.All(comparisons, item => Assert.InRange(item.Comparison.ZeroCrossingRatio, 0.8f, 1.1f));
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Assert.All(comparisons, item => Assert.InRange(item.Comparison.ZeroCrossingRatio, 0.8f, 1.11f));
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Assert.All(comparisons, item => Assert.True(item.Comparison.Score >= 0.6f, report));
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}
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@ -174,7 +175,7 @@ public sealed class Dx7ReferenceParityTests
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public async Task PublicDomainDx7AnlgSyn1KeepsBuzzingModulationWhenInstalled()
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{
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var result = await RenderAndComparePublicDomainDx7VoiceAsync(
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new CommunityDx7VoiceCase(7, "ANLGSYN 1", 0.65f, 1.0f, 0.25f));
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new CommunityDx7VoiceCase(7, "ANLGSYN 1", 0.65f, 1.0f, 0.75f));
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if (result is null)
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{
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@ -212,7 +213,7 @@ public sealed class Dx7ReferenceParityTests
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var comparison = await RenderAndCompareProjectAuthoredDx7Async(
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spec,
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graphName: "dx7_algorithm8_summed_stack_probe",
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graphGain: 0.218f,
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graphGain: 0.654f,
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noteDurationSeconds: 0.45f,
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renderDurationSeconds: 0.7f);
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@ -243,7 +244,7 @@ public sealed class Dx7ReferenceParityTests
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var comparison = await RenderAndCompareProjectAuthoredDx7Async(
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spec,
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graphName: "dx7_algorithm8_cascade_probe",
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graphGain: 0.25f,
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graphGain: 0.75f,
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noteDurationSeconds: 0.45f,
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renderDurationSeconds: 0.7f);
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@ -274,7 +275,7 @@ public sealed class Dx7ReferenceParityTests
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var comparison = await RenderAndCompareProjectAuthoredDx7Async(
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spec,
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graphName: "dx7_algorithm8_summed_pair_probe",
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graphGain: 0.25f,
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graphGain: 0.75f,
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noteDurationSeconds: 0.45f,
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renderDurationSeconds: 0.7f);
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@ -151,13 +151,13 @@ public sealed class Dx7SysExTests
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}
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[Fact]
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public void MapsDx7AlgorithmOutputCompensationRelativeToAlgorithmThirtyTwo()
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public void DoesNotApplyDx7AlgorithmOutputCompensationToImportedOperators()
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{
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var algorithm8 = Dx7SysEx.AlgorithmTopology(8);
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var algorithm32 = Dx7SysEx.AlgorithmTopology(32);
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Assert.Equal(3, Dx7SysEx.OperatorOutputCompensation(algorithm8, 1));
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Assert.Equal(3, Dx7SysEx.OperatorOutputCompensation(algorithm8, 3));
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Assert.Equal(1, Dx7SysEx.OperatorOutputCompensation(algorithm8, 1));
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Assert.Equal(1, Dx7SysEx.OperatorOutputCompensation(algorithm8, 3));
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Assert.Equal(1, Dx7SysEx.OperatorOutputCompensation(algorithm8, 2));
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Assert.Equal(1, Dx7SysEx.OperatorOutputCompensation(algorithm32, 1));
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue