Octrel

Chords that rise and sink together.

Clean polyphonic octaves: a sub, a second sub and an octave up that follow chords, with their own levels, a darkening filter for the subs and a squash that keeps the octave voices even.

◆ Paidorg.sournd.pitch.octrel

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.pitch.octrel
Category: Pitch
Type: Octaver, shifter
Licence: £2.99 once, or in the subscription
Version: 1.0.0
Parameters: 8
Latency: 624 samples (13.0 ms at 48 kHz)
Tail: 0.2 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	`sub_level`	Sub	0	100	80	%	linear
1	`sub2_level`	Sub 2	0	100	0	%	linear
2	`up_level`	Up	0	100	0	%	linear
3	`dry_level`	Dry	0	100	100	%	linear
4	`sub_tone_hz`	Sub tone	60	8000	2500	Hz	log
5	`up_tone_hz`	Up tone	500	16000	5000	Hz	log
6	`squash`	Squash	0	100	60	%	linear
7	`output_db`	Output	-24	12	0	dB	linear

How it is made

Original sOURnd design blending general techniques: a sinusoidal phase vocoder on the analytic signal (low-delay asymmetric window, whole-lobe resynthesis of every partial, transient phase reset) driving three voices from one analysis, two-pole low-passes on the voices and an envelope-driven wet compressor. Voicing informed by our own measurements of polyphonic octave pedals (dark subs, compressed octave voices).

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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.pitch.octrel" };
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.octrel", &e) == SOURND_OK) {
    sournd_engine_prepare(e, 48000.0, 512);
    sournd_engine_set_param(e, 0, 80); /* Sub */
    sournd_engine_process(e, in, out, 2, frames);
    sournd_engine_destroy(e);
}

Ask your AI

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Prompt

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