code: function LGAudioGain() {
          //default
          this.properties = {
              gain: 1
          };
  
          this.audionode = LGAudio.getAudioContext().createGain();
          this.addInput("in", "audio");
          this.addInput("gain", "number");
          this.addOutput("out", "audio");
      }
docs: *****************************************************