coef.b0, coef.b1, coef.b2], [1, coef.a1, coef.a2]);

          let merger = context.createChannelMerger(2);
          // Create the graph
          source.connect(biquad);
          source.connect(iir);

          biquad.connect(merger, 0, 0);
          iir.connect(merger, 0, 1);

          merger.connect(context.destination);

          // Rock and roll!
          source.start();

          context.startRendering()
              .then(function(result) {
                // Find the max amplitude of the resu