CODEWITHSUNDEEP
nodeseffectsweb-audio-api
Aptary
Aptary

Reputation: 49

Creating Audio Effects with Web Audio is an output node necessary?

I'm reading about custom audio effects with web audio: http://www.html5rocks.com/en/tutorials/casestudies/jamwithchrome-audio/

An example they give is this delay loop

enter image description here 

var SlapbackDelayNode = function(){
    //create the nodes we’ll use
    this.input = audioContext.createGainNode();
    var output = audioContext.createGainNode(),
        delay = audioContext.createDelayNode(),
        feedback = audioContext.createGainNode(),
        wetLevel = audioContext.createGainNode();

    //set some decent values
    delay.delayTime.value = 0.15; //150 ms delay
    feedback.gain.value = 0.25;
    wetLevel.gain.value = 0.25;

    //set up the routing
    this.input.connect(delay);
    this.input.connect(output);
    delay.connect(feedback);
    delay.connect(wetLevel);
    feedback.connect(delay);
    wetLevel.connect(output);

    this.connect = function(target){
       output.connect(target);
    };
};

My question is this: Is there any compelling reason to have the output gain node? Wondering if it's there for educational reasons, or if it is actually serving a purpose which I've not grasped.

You could directly connect the wetLevel node to the target, and that would save you having to create the output node.

 this.connect = function(target){
      wetLevel.connect(target);
 };

Upvotes: 0

Views: 88

Answers (1)

cwilso
cwilso

Reputation: 13908

You could skip the output node. It's mostly there as a convenience, to be able to quickly and easily disconnect the output of the subgraph in one go (rather than having to disconnect from two different nodes). You don't always need this kind of convenience.

Upvotes: 1

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