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Upgrade to ten-band EQ with migrated curves and headphone widening

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Jonathan Sykes
2026-10-03 15:16:09 +08:00
parent 0b3e82a768
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# Equalizer and stereo width
`frontend/eq-core.js` is the single band/preset definition for both live EQ and EqRender: 31, 62, 125, 250, 500, 1000, 2000, 4000, 8000 and 16000 Hz. Existing five-band curves migrate by logarithmic frequency interpolation; edge gains extend to the new endpoints. Migration preserves user curves instead of replacing them with a new preset.
The headphone widener is off by default. It delays the right channel by up to 15 ms (Haas effect); it can colour speaker playback and mono mixes. Live EQ and saved-song renders use the same widener graph, vocal matrix and bands. Render signatures include all three, so changed settings invalidate old processed copies. iPhone streams still require the existing Live sound processing opt-in; saved copies use OfflineAudioContext. A new rendered copy is used on a subsequent playback.
Review with actual headphones and an iPhone: centre image at 0%, mono compatibility at higher values, rendered/live EQ correspondence, and lock-screen playback of saved songs. Model-based separation is outside this feature; see vocal-stems.md.