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Moog style filter and Bitcrusher added! Also, make sure you update your filter nodes to use strings instead of integers for filter type!

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
• Bitcrusher
• Moog Filter

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: 440, //20 to 22050
                Q: 1, //0.001 to 100
                gain: 0, //-40 to 40
                filterType: "lowpass", //lowpass, highpass, bandpass, lowshelf, highshelf, peaking, notch, allpass
                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: 4,         //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
             });

A lo-fi bitcrusher effect.

var bitcrusher = new tuna.Bitcrusher({
                     bits: 4,          //1 to 16
                     normfreq: 0.1,    //0 to 1
                     bufferSize: 4096  //256 to 16384
                 });

A resonant, analog-sounding filter.

var moog = new tuna.MoogFilter({
               cutoff: 0.065,    //0 to 1
               resonance: 3.5,   //0 to 4
               bufferSize: 4096  //256 to 16384
           });