Stairwhorl

Rising forever, never resetting.

Endless sweep: phaser or flanger notches that keep rising, or keep falling, forever without ever resetting.

◆ Paidorg.sournd.modulation.stairwhorl

Hear it

Every parameter plays here, rendered on our server. Pick a test sound or your own file, move the dials or press Randomise, and switch bypass to compare.

Details

Engine id: org.sournd.modulation.stairwhorl
Category: Modulation
Type: Barber pole, phaser
Licence: £2.99 once, or in the subscription
Version: 1.0.0
Parameters: 6
Latency: none
Tail: 0.1 s
Sidechain input: no
Channels: mono or stereo

Parameters

The id is the C ABI parameter id and the JUCE parameter id (as a decimal string).

Id	Key	Name	Min	Max	Default	Unit	Taper
0	`rate_hz`	Rate	0.01	2	0.08	Hz	log
1	`direction`	Direction	0	1	1	-	linear
2	`mode`	Mode	0	1	0	-	linear
3	`range_oct`	Range	2	8	6	oct	linear
4	`stereo`	Stereo	0	100	25	%	linear
5	`mix`	Mix	0	100	50	%	linear

How it is made

Original sOURnd design blending general techniques: several exponentially swept phaser and flanger voices with evenly staggered start points, raised-cosine crossfade windows that sum to a constant (a Shepard-style illusion), Hermite-interpolated delay reads and a stereo sweep offset.

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CMake

cmake

juce_add_module(path/to/sournd_engine)
target_include_directories(MyPlugin PRIVATE path/to/include)
target_link_libraries(MyPlugin PRIVATE sournd_engine path/to/libsournd_cabi.a)

Three lines. Full steps: JUCE quick start.

C++ (JUCE)

cpp

#include <sournd_engine/sournd_engine.h>

sournd::SourndEngine engine { "org.sournd.modulation.stairwhorl" };
juce::AudioProcessorValueTreeState parameters { *this, nullptr, "Parameters",
    sournd::SourndEngineParameters::createLayout (engine) };
sournd::SourndEngineParameters bridge { engine, parameters };

// prepareToPlay
engine.prepare ({ sampleRate, (juce::uint32) maximumBlock, 2 });
bridge.prepare (sampleRate);
setLatencySamples ((int) engine.latency());

// processBlock
bridge.apply ((uint32_t) buffer.getNumSamples());
juce::dsp::AudioBlock<float> block { buffer };
engine.process (juce::dsp::ProcessContextReplacing<float> { block });

// get/setStateInformation: hold getCallbackLock() around saveState / loadState,
// so state work never overlaps processBlock (full example: /docs/juce/)

Plain C

sournd_engine *e = NULL;
if (sournd_engine_create("org.sournd.modulation.stairwhorl", &e) == SOURND_OK) {
    sournd_engine_prepare(e, 48000.0, 512);
    sournd_engine_set_param(e, 0, 0.08); /* Rate */
    sournd_engine_process(e, in, out, 2, frames);
    sournd_engine_destroy(e);
}

Ask your AI

Paste this into your coding assistant:

Prompt

Add the sournd engine org.sournd.modulation.stairwhorl to my JUCE plugin. Follow https://sournd.com/docs/juce/index.md
and the engine reference at https://sournd.com/engines/stairwhorl/index.md. Expose every parameter through APVTS.