Kammerl

Any sound, made to ring.

Tuned comb filter: rings any sound at a note or frequency, from a subtle metallic sheen to a singing, pitched resonance. Flip the polarity for a hollow tone an octave down; damping softens the ring.

● Freeorg.sournd.filter.kammerl

Hear it

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

Details

Engine id: org.sournd.filter.kammerl
Category: Filter
Type: Comb
Licence: Free, closed library (use it in any plugin)
Version: 1.0.0
Parameters: 11
Latency: none
Tail: 8 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	`tuning`	Tuning	0	1	0	-	linear
1	`note`	Note	24	96	57	note	linear
2	`fine_cents`	Fine	-100	100	0	cents	linear
3	`freq_hz`	Frequency	30	5000	220	Hz	log
4	`feedback`	Feedback	0	95	70	%	linear
5	`feedforward`	Feed-forward	0	100	0	%	linear
6	`polarity`	Polarity	0	1	0	-	linear
7	`damping_hz`	Damping	500	20000	9000	Hz	log
8	`spread_cents`	Spread	0	50	0	cents	linear
9	`mix`	Mix	0	100	100	%	linear
10	`output_db`	Output	-24	12	0	dB	linear

How it is made

Original sOURnd design blending general techniques: a fractional-delay feedback comb with a one-pole damper in the loop (its group delay compensated in the tuning), a feed-forward tap, polarity inversion and noise-power normalisation.

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