Audio Issues when powering a GoPro with an Evo SS

When I try to power a GoPro Hero 3+ with the Evo SS Power Lead I get a horrible buzzing sound. I uploaded a sample:

https://youtu.be/Oosnz1e6Omo

The GoPro audio is perfectly clear when running on it's own internal batter, it is also perfectly clear when powered via a USB cable and an A/C Adapter or an external Power Bank.

As soon as I connect the power lead via the cable supplied with the unit, the sound goes to absolute CRAP with horrible buzzing noise.