leRate);
        let rampBuffer = new AudioBuffer(
            {length: renderLength, sampleRate: context.sampleRate});
        let data = new Float32Array(renderLength);
        let startValue = 5;
        for (let k = 0; k < data.length; ++k) {
          data[k] = k + startValue;
        }
        rampBuffer.copyToChannel(data, 0);

        let src = new AudioBufferSourceNode(
            context, {buffer: rampBuffer, playbackRate: 0});

        src.connect(context.destination);

        // Purposely star