Mainline Audio

Technical Notes

Notes on mastering, signal processing, and the decisions behind the tools.

Technical Note

Focus, Spread, and the Shape of a Filter Bank

What eight filters have in common when you move them together.

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Technical Note

Minimum, Natural and Linear Phase EQ — What Actually Changes?

The curve can look the same while the filter behaves differently in time.

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Technical Note

True Peak Is a Constraint, Not a Target

Why inter-sample peaks matter — and why the goal is transparent protection, not another number to chase.

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