Good news! We have a Sierra driver for the V7!!! You can download the latest driver at the product page on www.numark.com. There is a known issue that if your computer goes to sleep while your device is connected, you may experience noise/distortion once the computer is woken up. In order to resolve this, you will need to disconnect and reconnect your advice. So that you don't experience this issue, we recommend you Optimize your computer.