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New effects added: Chorus, Phaser, and Tremolo.
Be sure to follow us at @DinahmoeSTHLM for future updates. Feel free to create your own effects and give us a pull request!

tuna

An audio effects library for the Web Audio API. Created by DinahMoe

Effect list:

• Overdrive (6 different algorithms)
• Filter
• Cabinet
• Delay
• Convolver (Reverb)
• Compressor
• WahWah
• Tremolo
• Phaser
• Chorus

Usage

Start by creating a new Tuna object like so:

var context = new AudioContext();
var tuna = new Tuna(context);

You need to pass the audio context you're using in your application. Tuna will be using it to create its effects.

You create a new tuna node as such:

var chorus = new tuna.Chorus({
                 rate: 1.5,
                 feedback: 0.2,
                 delay: 0.0045,
                 bypass: 0
             });

You can then connect the tuna node to native Web Audio nodes by doing:

nativeNode.connect(chorus.input);
chorus.connect(anotherNativeNode);

or to other tuna nodes by doing:

tunaNode.connect(chorus.input);
chorus.connect(anotherTunaNode.input);

All tuna nodes are connected TO by using the nodes input property, but connecting FROM the tuna node works as it does with ordinary native AudioNodes.

The nodes

A basic chorus effect.

var chorus = new tuna.Chorus({
                 rate: 1.5,         //0.01 to 8+
                 feedback: 0.2,     //0 to 1+
                 delay: 0.0045,     //0 to 1
                 bypass: 0          //the value 1 starts the effect as bypassed, 0 or 1
             });

A delay effect with feedback and a lowpass filter applied to the delayed signal.

var delay = new tuna.Delay({
                feedback: 0.45,    //0 to 1+
                delayTime: 150,    //how many milliseconds should the wet signal be delayed? 
                wetLevel: 0.25,    //0 to 1+
                dryLevel: 1,       //0 to 1+
                cutoff: 2000,      //cutoff frequency of the built in lowpass-filter. 20 to 22050
                bypass: 0
            });

A basic phaser effect.

var phaser = new tuna.Phaser({
                 rate: 1.2,                     //0.01 to 8 is a decent range, but higher values are possible
                 depth: 0.3,                    //0 to 1
                 feedback: 0.2,                 //0 to 1+
                 stereoPhase: 30,               //0 to 180
                 baseModulationFrequency: 700,  //500 to 1500
                 bypass: 0
             });

A basic overdrive effect.

var overdrive = new tuna.Overdrive({
                    outputGain: 0.5,         //0 to 1+
                    drive: 0.7,              //0 to 1
                    curveAmount: 1,          //0 to 1
                    algorithmIndex: 0,       //0 to 5, selects one of our drive algorithms
                    bypass: 0
                });

A compressor with the option to use automatic makeup gain.

var compressor = new tuna.Compressor({
                     threshold: 0.5,    //-100 to 0
                     makeupGain: 1,     //0 and up
                     attack: 1,         //0 to 1000
                     release: 0,        //0 to 3000
                     ratio: 4,          //1 to 20
                     knee: 5,           //0 to 40
                     automakeup: true,  //true/false
                     bypass: 0
                 });

A convolver with high- and lowcut. You can find a lot of impulse resonses here, or by searching for "free impulse response files".

var convolver = new tuna.Convolver({
                    highCut: 22050,                         //20 to 22050
                    lowCut: 20,                             //20 to 22050
                    dryLevel: 1,                            //0 to 1+
                    wetLevel: 1,                            //0 to 1+
                    level: 1,                               //0 to 1+, adjusts total output of both wet and dry
                    impulse: "impulses/impulse_rev.wav",    //the path to your impulse response
                    bypass: 0
                });

A basic filter.

var filter = new tuna.Filter({
                 frequency: 20,         //20 to 22050
                 Q: 1,                  //0.001 to 100
                 gain: 0,               //-40 to 40
                 filterType: 0,         //0 to 7, corresponds to the filter types in the native filter node: lowpass, highpass, bandpass, lowshelf, highshelf, peaking, notch, allpass in that order
                 bypass: 0
             });

A cabinet/speaker emulator.

var cabinet = new tuna.Cabinet({
                  makeupGain: 1,                                 //0 to 20
                  impulsePath: "impulses/impulse_guitar.wav",    //path to your speaker impulse
                  bypass: 0
              });

A basic tremolo.

var tremolo = new tuna.Tremolo({
                  intensity: 0.3,    //0 to 1
                  rate: 0.1,         //0.001 to 8
                  stereoPhase: 0,    //0 to 180
                  bypass: 0
              });

A wahwah with an auto wah option.

var wahwah = new tuna.WahWah({
                 automode: true,                //true/false
                 baseFrequency: 0.5,            //0 to 1
                 excursionOctaves: 2,           //1 to 6
                 sweep: 0.2,                    //0 to 1
                 resonance: 10,                 //1 to 100
                 sensitivity: 0.5,              //-1 to 1
                 bypass: 0
             });