Primitives

Source of truth: the doc comments on each module struct in patches-modules/src/ define the canonical port names, parameter ranges, and behaviour. This page is kept in sync with those comments.

Small DSP building blocks that are useful on their own and as components inside larger patches. See ADR 0076.

DcBlocker — One-pole DC removal

Thin wrapper over the shared patches_dsp::DcBlocker kernel: a one-pole highpass at ~5 Hz. No parameters; the cutoff is fixed by the kernel. Useful after waveshapers, bias injection, or any process that may introduce a DC offset.

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Comb — Universal comb (FF / FB / both)

Single module covering feed-forward (FIR), feedback (IIR), and combined pole-zero comb topologies via a mode enum. The feedback parameter is the coefficient on the delayed tap; its meaning depends on mode:

ff   : y[n] = mix · (x[n] + g · x[n−D])
fb   : y[n] = mix · y'[n]              where y'[n] = x[n] + g · y'[n−D]
both : y[n] = mix · y'[n]              where y'[n] = x[n] + g · x[n−D] + g · y'[n−D]

y' is the pre-mix signal — feedback recursion uses the unmixed value so adjusting mix does not destabilise the loop.

In modes that include fb the caller is responsible for keeping feedback strictly below 1.0. The module does not clamp on the user’s behalf; feedback ≥ 1 produces unbounded growth (the same convention as other recursive modules in the bundle).

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