Swoopline

An octave of glass above.

Octave up straight from the waveform: glassy and clean on one side, ringing and fuzzy on the other, with drive, a gate that trims the tails and a tone control. No latency.

● Freeorg.sournd.pitch.swoopline

Hear it

Hear its studio demo. The live engine, with every parameter, is in your download.

Details

Engine id: org.sournd.pitch.swoopline
Category: Pitch
Type: Octaver
Licence: Free, closed library (use it in any plugin)
Version: 1.0.0
Parameters: 8
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	`up_level`	Octave	0	100	80	%	linear
1	`dry_level`	Dry	0	100	100	%	linear
2	`character`	Character	0	100	40	%	linear
3	`focus_hz`	Focus	100	3000	800	Hz	log
4	`drive_db`	Drive	0	30	6	dB	linear
5	`tone_hz`	Tone	500	16000	5000	Hz	log
6	`gate_db`	Gate	-80	-20	-50	dB	linear
7	`output_db`	Output	-24	12	0	dB	linear

How it is made

Original sOURnd design blending general techniques: a focus low-pass, an all-pass Hilbert pair for the analytic signal and phase doubling, full-wave rectification with DC blocking, tanh drive, a 2:1 downward expander below a threshold and a two-pole tone filter. Character informed by our own measurements of rectifier-style octave-up circuits (period kept, tails gated, upper harmonics lifted).

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.pitch.swoopline" };
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.pitch.swoopline", &e) == SOURND_OK) {
    sournd_engine_prepare(e, 48000.0, 512);
    sournd_engine_set_param(e, 0, 80); /* Octave */
    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.pitch.swoopline to my JUCE plugin. Follow https://sournd.com/docs/juce/index.md
and the engine reference at https://sournd.com/engines/swoopline/index.md. Expose every parameter through APVTS.