So today I was dumping some data from my Zero to my desktop and decided to use WiFi rather than USB (I was being lazy)
So I connected up as normal using Filezilla and started to copy some files off, and maybe I somehow have never noticed this before but the Right Speaker started buzzing in time with the data transmission.
I have included a sample of the audio here (I had to amplify it to make it easier to hear, though its clearly noticeable in person)https://www.dropbox.com/s/pitaqb8cr805jqq/GCW%20WiFi%20Buzz.wav?dl=0
I was transferring off the External SDCard (Formatted to Ext4) if that helps, also it did not affect the headphones and when I plugged the headphones in, the buzzing stopped until I removed them then the buzzing came back
I am using the latest official build as of today (2014-08-20)
Edit: After doing it for about 20 mins it randomly stopped