WebAudio - a set of oscillators

Question

I am creating three different linear tweets using the code found here on SO. With some other code snippets, I save these three sounds as separate .wav files. It still works.

Now I want to play these three sounds at the same time. Therefore, I thought that I could use the WebAudio API to feed three oscillator nodes with floating point arrays, which I got from the above code. But I will not get at least one node oscillator to reproduce its sound.

My code is still (compressed for one oscillator)

var osc = audioCtx.createOscillator();
var sineData = linearChirp(freq, (freq + signalLength), signalLength, audioCtx.sampleRate); // linearChirp from link above
// sine values; add 0 at the front because the docs states that the first value is ignored
var imag = Float32Array.from(sineData.unshift(0));  
var real = new Float32Array(imag.length); // cos values
var customWave = audioCtx.createPeriodicWave(real, imag);
osc.setPeriodicWave(customWave);
osc.start();

At the moment, I believe that I do not quite understand all the math behind the peridoc wave.

A code that plays three sounds at the same time works (with simple sin values ​​in the nodes of the oscillator), so I assume that the problem is in my peridoc wave.

Another question: is there any other way? Maybe using three MediaElementAudioSourceNode associated with my three WAV files. I do not see a way to play them at the same time.

Answer 1

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