GainNode.gain.value setter smoothing is deprecated

Hi guys

Recently I'm facing a warning in Chrome console: _GainNode.gain.value setter smoothing is deprecated_

![image](https://user-images.githubusercontent.com/13813964/36160422-4232a65e-10c8-11e8-8d73-392c280de2e0.png)

![image](https://user-images.githubusercontent.com/13813964/36160625-cacf7988-10c8-11e8-9000-c022a375b9a5.png)

Could it be a problem in the future?