javascript - Web audio API filter is not working -


so i'm creating synthesizer in browser , want add few filters it. created filter stuff , connect oscillator filter , fiter audio destination. when choose lowpass filter play, error in console , no effects being added: 

the provided value '3' not valid enum value of type biquadfiltertype.

snippet of code: 

function init() {   octavenumber = document.getelementbyid("octavenum");   audioctx = new (window.audiocontext || window.webkitaudiocontext);   osc = audioctx.createoscillator();   volume = audioctx.creategain();   filter = audioctx.createbiquadfilter();   osc.connect(filter);   volume.connect(audioctx.destination);   booleanval = false;   osc.frequency.value = freqslider.value   osc.start();   gaindisplay.innerhtml = gainslider.value; }  lowpass.addeventlistener("click", function(event) {     filter.type = 3;  // in case it's lowshelf filter     filter.frequency.value = 440;     filter.q.value = 0;     filter.gain.value = 0; })  function start() {     ui('start');     volume.gain.value = gainslider.value;     filter.connect(volume); }

what mean?

the error see pretty self explanatory. basically, filter.type = 3; isn't valid biquadfilternode type which, mdn lists, "is string (enum) value defining kind of filtering algorithm node implementing."

it's values strings: 'highpass', 'bandpass', 'lowshelf', 'highshelf', 'peaking', 'notch' , 'allpass'.

you can find meanings on mdn page.


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