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Tune SFXR high-pass Faust mapping

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Meta Vens 2026-05-12 21:55:27 +01:00
commit c09004923f
2 changed files with 2 additions and 1 deletions
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2
src/AquariumSynth.Dsl/FaustExport.cs
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@ -124,7 +124,7 @@ public static class FaustEmitter
source.AppendLine($"{name}_colored = ({name}_osc * (1.0 - {noiseMix}) + no.noise * {noiseMix});");
source.AppendLine($"{name}_driven = ma.tanh({name}_colored * (1.0 + {driveExpression} * 12.0)) / ma.tanh(1.0 + {driveExpression} * 12.0);");
source.AppendLine($"{name}_folded = {name}_driven * (1.0 - {foldExpression}) + fold({name}_driven * (1.0 + {foldExpression} * 3.5)) * {foldExpression};");
source.AppendLine($"{name}_filtered = {name}_folded : {lowpass} : fi.highpass(1, max(20.0, {hpf} * 8000.0));");
source.AppendLine($"{name}_filtered = {name}_folded : {lowpass} : fi.highpass(1, max(5.0, ({hpf}) * ({hpf}) * 7000.0));");
if (voice.Phaser.OffsetSeconds != 0 || voice.Phaser.RampSecondsPerSecond != 0)
{
var delay = $"min(2047.0, max(0.0, abs({F(voice.Phaser.OffsetSeconds)} + {F(voice.Phaser.RampSecondsPerSecond)} * age) * ma.SR))";

1
state/evidence.jsonl
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@ -1,3 +1,4 @@
{"kind":"migration","lesson":"The C# repo must own reusable authoring, analysis, preset, scoring, and Faust-generation behavior; only the Rust renderer/runtime and experimental compiler branch are intentionally left behind.","source":"user direction and migration pass through commit 3246672"}
{"kind":"realtime","lesson":"Runtime-facing audio code must avoid unbounded operations: allocation, locks, I/O, console output, OS calls, and context switches do not belong in audio callbacks.","source":"PortAudio callback documentation"}
{"kind":"dsp_graph","lesson":"Treat patch scripts as deterministic dataflow graphs with explicit rate and block semantics; terse syntax is acceptable only when lowering remains inspectable.","source":"Pure Data block/subpatch model and Faust block-diagram model"}
{"kind":"sfxr_parity","lesson":"SFXR normalized filter values are not linear cutoff frequencies. In Faust export, small SFXR high-pass values must remain very low; mapping hpf directly to thousands of Hz removes the body of pickup, jump, powerup, and blip presets while still leaving them audible enough for weak tests to pass.","source":"Aquarium engine native Faust parity test against C# SFXR reference renderer"}