Northnote

Every note finds its star.

Pitch correction for voices and single-note lines: pulls every note to the nearest note of your key and scale (chromatic, major, minor, pentatonics or your own 12-note set) at a speed from natural to a hard snap at 0 ms, with humanise to leave held notes and vibrato alone.

◆ Paidorg.sournd.pitch.northnote

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.northnote
Category: Pitch
Type: Pitch correction
Licence: £2.99 once, or in the subscription
Version: 1.0.0
Parameters: 21
Latency: 1024 samples (21.3 ms at 48 kHz)
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	`key`	Key	0	11	0	-	linear
1	`scale`	Scale	0	5	0	-	linear
2	`note_c`	C	0	1	1	-	linear
3	`note_cs`	C#	0	1	1	-	linear
4	`note_d`	D	0	1	1	-	linear
5	`note_ds`	D#	0	1	1	-	linear
6	`note_e`	E	0	1	1	-	linear
7	`note_f`	F	0	1	1	-	linear
8	`note_fs`	F#	0	1	1	-	linear
9	`note_g`	G	0	1	1	-	linear
10	`note_gs`	G#	0	1	1	-	linear
11	`note_a`	A	0	1	1	-	linear
12	`note_as`	A#	0	1	1	-	linear
13	`note_b`	B	0	1	1	-	linear
14	`retune_ms`	Retune	0	400	40	ms	linear
15	`humanise`	Humanise	0	100	0	%	linear
16	`reference_hz`	Reference	415	466	440	Hz	linear
17	`amount`	Amount	0	100	100	%	linear
18	`formant`	Formant keep	0	1	1	-	linear
19	`mix`	Mix	0	100	100	%	linear
20	`output_db`	Output	-24	12	0	dB	linear

How it is made

Original sOURnd design blending general techniques: a YIN pitch tracker with full-rate refinement, nearest-allowed-note quantisation against a 12-note mask and a reference pitch, one-pole retune smoothing lengthened on held notes (humanise), and pitch-synchronous overlap-add grains that keep the formants.

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C++ (JUCE)

cpp

#include <sournd_engine/sournd_engine.h>

sournd::SourndEngine engine { "org.sournd.pitch.northnote" };
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/)

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

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